# Problem of horizontal distance in choices

Why is the distance between the red parts not equal?

\documentclass[a4paper]{article}
\usepackage[margin=1.5cm]{geometry}
\usepackage{amsmath}
%
label-format=\MakeUppercase,
after-skip = 3ex,
}
%
\begin{document}
%
\task $360$
\task $190$
\task $209$
\task $300$
\task $120$