The Carbon-Carbon Single Bond in the Following Is Formed by the Overlap

Multiple Choice

The carbon-carbon single bond in the following is formed by the overlap of which two orbitals?
$\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{C} \equiv \mathrm{N}$

A) $\mathrm{sp}-\mathrm{sp}$
B) $\mathrm{sp}^{2}-\mathrm{sp}$
C) $\mathrm{sp}^{2}-\mathrm{sp}^{2}$
D) $\mathrm{sp}^{2}-\mathrm{sp}^{3}$