Which Statement Below About Bonds Between Two Carbon Atoms Is/are

Multiple Choice

Which statement below about bonds between two carbon atoms is/are TRUE? I) Bond strength increases as more electrons are shared between the atoms.
II) Bond strength increases as the overlap between atomic orbitals increases.
III) Hybrid orbitals account for the observed geometry and bond angles around each carbon atom.

A) I
B) II
C) III
D) Only two of these are correct statements.
E) All three are correct statements.