There are three similar answerables that all use the command \choice.

In each case that uses \choice, the order of the choices presented to the student is the order the author types in the code. The author marks correct answers with the option correct and leaves incorrect answers without options.

\choice[correct]{SOME-CORRECT-ANSWER}
\choice{SOME-INCORRECT-ANSWER}

Now we will discuss each specific environment that uses \choice. Multiple choice questions, including True/False, are intended for students to select one correct answer.

\begin{question}
Which of the following functions has a graph which is a parabola?
\begin{multipleChoice}
  \choice[correct]{$y=x^2+3x-3$}
  \choice{$y = \frac{1}{x+2}$}
  \choice{$y=3x+1$}
\end{multipleChoice}
\end{question}

If more than one choice is labeled correct with multipleChoice, any correct answer will result in completion of this answerable.

\begin{problem}
Select a prime number:
\begin{multipleChoice}
  \choice{1}
  \choice[correct]{2}
  \choice[correct]{3}
  \choice{4}
  \choice[correct]{5}
\end{multipleChoice}
\end{problem}

With multipleChoice the student is only able to select one answer before submitting. This could be useful for student surveys where every choice is marked as correct.

Select all problems allow the student to select any and all answers before submitting.

\begin{problem}
Select all prime numbers:
\begin{selectAll}
  \choice{1}
  \choice[correct]{2}
  \choice[correct]{3}
  \choice{4}
  \choice[correct]{5}
\end{selectAll}
\end{problem}

Select all problems can be very challenging for students. Authors can quickly make questions that are quite difficult without realizing it.

Word choice problems were designed for inline words; however, at this point we do support math in the choices. We give an example of \wordChoice in action below:

\begin{exercise}
 Consider the planes defined by the equations below.
\begin{align*}
  P_1:  \quad 4 &= 2x-y+3z  \\
  P_2:  \quad 5 &= 4x-2y+6z \\
  P_3:  \quad 7 &= 5x+2y+z
\end{align*}
Describe the relationships between the planes
$P_1$, $P_2$, and $P_3$ in terms of ‘‘parallel,’’
‘‘orthogonal,’’ or ‘‘neither.’’
\begin{enumerate}
  \item The planes $P_1$ and $P_2$ are \wordChoice{
    \choice[correct]{parallel}
    \choice{orthogonal}
    \choice{neither parallel nor orthogonal}
    }
  \item The planes $P_1$ and $P_3$ are \wordChoice{
    \choice{parallel}
    \choice{orthogonal}
    \choice[correct]
    {neither parallel nor orthogonal}}.
  \item The planes $P_2$ and $P_3$ are \wordChoice{
    \choice{parallel}
    \choice{orthogonal}
    \choice[correct]{neither parallel nor orthogonal}
    }
\end{enumerate}
\end{exercise}

It is difficult to have a PDF version of \wordChoice (unless you use the documentclass option wordchoicegiven so authors should take this into consideration.