Creating Random Unlabelled Graphs

Hi I am using exam class and I am trying to make random graphs for a multiple choice question as shown. Would appreciate it if the graphs can be aligned horizontally as A and B, C and D

\documentclass{article}
\usepackage{tikz}

\begin{document}
\begingroup\renewcommand\labelenumi{\Alph{enumi}.}%
\tikzset{every picture/.append style={baseline=2.1cm,
execute at begin picture={%
\draw[-latex] (-1.5,0) -- (2,0) node[above right]{$x$};
\draw[-latex] (0,-1) -- (0,2.5) node[below left]{$y$};}}}%
\begin{enumerate}
\item \begin{tikzpicture}
\draw[thick,latex-latex] (-0.5,-1) -- (2,1.5);
\end{tikzpicture}
\item \begin{tikzpicture}
\draw[thick,latex-latex] (-1,2) parabola bend (0,0) (1,2);
\end{tikzpicture}
\item \begin{tikzpicture}