For elements P, Q, R and S, the corresponding valencies and average orbital energies are listed below.

Element	Valency	Average Valence Orbital Energy (eV)
P	i	-19
Q	j	-22.5
R	k	-9
S	l	-7

Based on the Van-Arkel diagram, the correct option from the following

A. S_jQ_l is covalent.

B. P_kR_i is ionic.

C. R_IS_k is metallic.

D. P_jQ_i is covalent is