Bnkqwgc

Here is an alternative using the tasks package:

\\documentclass{article}
\\usepackage{tasks}
\\setlength{\\parindent}{0pt}

\\begin{document}

\\textbf{Question}: Here is the question text. Answers are arranged in 4 columns.
\\begin{tasks}(4)
\\task first answer
\\task second answer
\\task third answer
\\task fourth answer
\\end{tasks}

\\bigskip

\\textbf{Question}: Here is the question text. Answers are arranged in 2 columns.
\\begin{tasks}(2)
\\task first answer
\\task second answer
\\task third answer
\\task fourth answer
\\end{tasks}

\\bigskip

\\textbf{Question}: Here is the question text. Answers are arranged in 2 columns and are longer than a single line.
\\begin{tasks}(2)
\\task first answer first answer first answer first answer
\\task second answer second answer second answer
\\task third answer 
\\task fourth answer
\\end{tasks}

\\end{document}

If yu want your answer to spread across the whole textwidth, you could use tabularx as follows: (The red vertical lines indicate the width of the textblock)

\\documentclass{article}
\\usepackage{tabularx}
\\setlength{\\parindent}{0pt}
\\begin{document}

\\textbf{Question}: Here is the question text. Answers are arranged in 4 columns and take up the entire textwidth.

\\begin{tabularx}{\\textwidth}{@{}X>{\\centering\\arraybackslash}X>{\\centering\\arraybackslash}X>{\\raggedleft\\arraybackslash}X@{}}
 \\textbf{A} first answer &
 \\textbf{B} second answer &
 \\textbf{C} third answer &
 \\textbf{D} fourth answer
\\end{tabularx}

\\end{document}

I am pretty sure that there are several ways. I propose TikZ way due to its flexibility. We can write a new command for this.

\\documentclass{article}
\\usepackage{tikz}
\\begin{document}
\\centerline{\\LARGE\\bfseries\\textcolor{blue}{TIKZ for multiple choices}} 
\\vspace*{1cm}

\\noindent{\\bfseries Question 1.} This question has $2$ choices.

\\noindent\\begin{tikzpicture}
\\pgfmathsetmacro{\\a}{\\textwidth}
\\path[font=\\bfseries,blue] 
(0,0)         node{A. $x=1$}
++(0:\\a/2 pt) node{B. $x=6$};
\\end{tikzpicture}

\\noindent{\\bfseries Question 2.} This question has $3$ choices.

\\noindent\\begin{tikzpicture}
\\pgfmathsetmacro{\\a}{\\textwidth}
\\path[n/.style={font=\\bfseries,circle,draw=blue,fill=gray!30},inner sep=1pt] 
(0,0)         node[n]{A}  +(0:1) node{$m=3$}
++(0:\\a/3 pt) node[n]{B}  +(0:1) node{$m=4$}
++(0:\\a/3 pt) node[n]{C}  +(0:1) node{$m=3$};
\\end{tikzpicture}

\\noindent{\\bfseries Question 3.} This question has $4$ choices.

\\noindent\\begin{tikzpicture}
\\pgfmathsetmacro{\\a}{\\textwidth}
\\path[font=\\bfseries,blue,right] 
(0,0)         node{A. $x=1$}
++(0:\\a/4 pt) node{B. $x=6$}
++(0:\\a/4 pt) node{C. $x=8$}
++(0:\\a/4 pt) node{D. $x=6688$};
\\end{tikzpicture}

\\noindent{\\bfseries Question 4.} This question also has $4$ choices. You can see choices of Question $3$ and Question $4$ are vertically aligned.

\\noindent\\begin{tikzpicture}
\\pgfmathsetmacro{\\a}{\\textwidth}
\\path[font=\\bfseries,magenta,right] 
(0,0)         node{A. $y=11$}
++(0:\\a/4 pt) node{B. $y=66$}
++(0:\\a/4 pt) node{C. $y=88$}
++(0:\\a/4 pt) node{D. $y=668866$};
\\end{tikzpicture}

\\noindent{\\bfseries Question 5.} This question also has $4$ choices with other arrangement.

\\noindent\\begin{tikzpicture}
\\pgfmathsetmacro{\\a}{\\textwidth}
\\path[font=\\bfseries,right] 
(0,0)        node[blue]   {A. Blue}
+(0:\\a/2 pt) node[red]    {B. Red}
++(-90:.5)   node[violet] {C. Violet}
+(0:\\a/2 pt) node[orange] {D. Orange};
\\end{tikzpicture}

\\end{document}