What can be the average arithmetic mean of $2x+1,\;x+2, \;2x-3,\;3x+4, \;3x$ and $2x-1$, if $x=-1$

Question

$\begin{array}{1 1} (a)\; \dfrac{5}{2} \\ (b)\; \dfrac{-5}{2} \\ (c)\; \dfrac{3}{2} \\ (d)\;\dfrac{-3}{2} \end{array}$