Determine the geometry for how two acetonitrile molecules would interact with each other

Acetonitrile molecules are mainly used in lithium batteries as a solvent, and is commonly found in the air from vehicle exhaust.

The geometry on how two acetonitrile molecules would interact with each other is as follows:

             
 C  N

The carbon atom has a single bond to the atom on its left side while having a triple bond on the nitrogen atom on the right side.
       

The answer is a) carbon-12