Which of the Following Statements Is Correct?
A) $\sigma$ Bonds Result from the Head-To-Head Overlap of Atomic Orbitals)

Which of the following statements is correct?

A) ( $\sigma$ bonds result from the head-to-head overlap of atomic orbitals) .
B) A triple bond is composed of two $\sigma$ bonds and one $\pi$ bond.
C) Free rotation may occur about a double bond.
D) ( $\pi$ bonds have electron density on the internuclear axis) .
E) More than one of these statements are correct.