In case of nitrogen, `NCl_(3)` is possible but not `NCl_(5)` while in case of phosphorous, `PCl_(5)` as well as `PCl_(5)` are possible. It is due to
A. Availability of vacant d-orbital 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
