Why does carbon monoxide a triple bond instead of a double

Carbon and oxygen together have a total of 10 electrons in the valence shell. Following the octet rule for both carbon and oxygen, the two atoms form a triple bond, with six shared electrons in three bonding molecular orbitals, rather than the usual double bond found in organic carbonyl compounds.

Explanation:

If there was a double bond between the carbon and the oxygen, either the oxygen or carbon would only have access to six electrons, thus violating the octet rule. I think this is right but I'm not 100% sure

i think that the best answer would be c.

tell me if im wrong : )

it's c.us forest service