According to V.B.T. a covalent bond is formed by the overlapping of half filled atomic orbitals with electron spinning in the opposite direction. The strength of a bond depends on extent of overlapping. Double bond energy is not twice that of single bond energy because a double bond is made up of a weak a bond and strong o bond.
According to V.B.T, in the formation of `CH_4` molecule the type of overlappings observed are

Options

A. `p-s ,s-s`
B. `p-s`
C. `sp^3 -s,s-s`
D. `sp^2 -s,s-s`

Answer

A