In case of nitrogen, `NCl_(3)` is possible but not `NCl_(5)` while in case of phosphorous, `PCl_(5)` are possible. It is due to
A. availability of vacant d-orbitals in P but not in N
B. lower electronegativity of P than N
C. lower tendency of H-bond formation in P than N
D. occurrence of P in solid while N in gaseous state at room temperature.
