I imagine it should be something like this:

\begin{wrapfigure}{r}{0.5\textwidth}
\begin{center}
\includegraphics[width=0.48\textwidth]{birds}
\end{center}
\caption{Birds}
\end{wrapfigure}

Taken from: https://www.overleaf.com/learn/latex/wrapping_text_around_figures

Tried this way, on a working project:

\element{6.2.1 Central electrica}{
\begin{question}{c.hidro-wrapped}
\begin{wrapfigure}{r}{32mm}
\vspace{-2\baselineskip}
\begin{center}
\includegraphics[width=30mm]{./Figures/chidroe.png}
\end{center}
\end{wrapfigure}
La figura mostra
\begin{choices}
\correctchoice{una central hidroelèctrica}
\wrongchoice{una central tèrmica}
\wrongchoice{una central nuclear}
\wrongchoice{una central geotèrmica}
\end{question}
\vspace{5\baselineskip}}

And got this message:

[1 <./Figures/partscnuclear.jpg>] [2]
! LaTeX Error: Environment wrapfigure undefined.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.

Any light would be very welcomed

I forgot the line:

\end{choices}

Anyway, I get the same result after adding the missing line:

[@1 <./Figures/partscnuclear.jpg>] [2]
! LaTeX Error: Environment wrapfigure undefined.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.932 }

! LaTeX Error: \begin{minipage} on input line 932 ended by \end{wrapfigure}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

@

Got it!

Need the package:

\usepackage{wrapfig}

!!

Unfortunately, next question writes down over this picture. Pic enclosed

Any idea?

Btw. Neither know why question text starts on next line. Compre with next question.

Try enclosing the choices and the figure into two parbox'es.

\begin{question}{test}
  \parbox[c]{.46\linewidth}{
     Question
     \begin{choices}
       ...
     \end{choices}
  }
  \parbox[c]{.46\linewidth}{
    ...figure...
  }
\end{question}

Génial!

Thanks a lot.