Nitrogen can form only one chloride with chlorine which is \(NCl_3\) whereas P can form \(PCl_3\) and \(PCl_5\). This is
(a) due to absence of d-orbitals in nitrogen
(b) due to difference in size of N and P
(c) due to higher reactivity of P towards Cl than N
(d) due to presence of multiple bonding in nitrogen