Correct Answer - B
Each carbon atom in ethylene is attached to two hydrogen atoms by single covalent bonds and to another carbon atoms by a double bond. Since each carbon is attached to three other atoms, it uses `sp^(2)` hybrid orbitals and an unhybridised `p_(z)` orbitals to form its bond. Each C-H bond is a `sigma` bond resulting from the overlap of 1 s orbital of hydrogen atom and `sp^(2)` orbital of a carbon atom. One C-C bond results from the linear overlap of `sp^(2)` orbitals one from each carbon atoms. One `pi` bonds results from the lateral overlap of two unhybridised `p_(z)` orbitals, one from each carbon atom.