In acetonitrile, CH3–C≡N, which set of atomic orbitals overlaps to form the σ bond between the methyl carbon (CH3) and the nitrile carbon (C≡N)?
a) sp2 on the methyl carbon with sp on the nitrile carbon
b) sp on both carbons
c) sp3 on the methyl carbon with sp on the nitrile carbon
d) sp3 on the methyl carbon with sp2 on the nitrile carbon