The answer sheets I use require that A=True and B=False. If I create a true/false question using choiceshoriz, it shuffles the answers. If I add the [o] option, it no longer displays the answers horizontally.
<pre>


\begin{question}{Fair Gamble}
A risk-neutral person will always take a fair gamble.
\begin{choiceshoriz}[o]
\correctchoice{True}
\wrongchoice{False}
\end{choiceshoriz}
\end{question}
</pre>