The ionic equations represent the reactions between four metals, P, Q, R and S, and solutions of the salts of the same metals

P + Q2+ -> no reaction
R + P2+ -> R2+ + P
Q + S2+ -> Q2+ + S
S + P2+ -> S2+ + P
S + R2+ -> S2+ + R
S + Q2+ -> no reaction

What is the correct order of reactivity of the metals?

Most -----------------------> least
A. P R S Q
B. Q R S P
C. Q S R P
D. S Q P R