The Triple Bond in Ethyne Is Made Up of

The triple bond in ethyne is made up of

A) two pi bonds and a sigma bond, each formed by a lateral overlap of two p orbitals.
B) a sigma bond formed by overlap of two s orbitals and two pi bonds, each formed by lateral overlap of two p orbitals.
C) a sigma bond formed by end-on overlap of two sp² orbitals and a pi bond formed by lateral overlap of two p orbitals.
D) two pi bonds, each formed by lateral overlap of two p orbitals, and a sigma bond formed by end-on overlap of two sp orbitals.
E) two pi bonds, each formed by end-on overlap of two p orbitals, and a sigma bond formed by lateral overlap of two sp orbitals.