D-erythrose and its isomers are listed as P, Q, R, and S in column i. Choose the correct relationship of P, Q, R, and S with D-erythrose from column ii.

A) P = D-threose, Q = D-erythrulose, R = D-erythrose, S = D-ribulose
B) P = D-erythrulose, Q = D-ribulose, R = D-threose, S = D-erythrose
C) P = D-ribose, Q = D-erythrose, R = D-erythrulose, S = D-threose
D) P = D-erythrose, Q = D-threose, R = D-ribose, S = D-ribulose

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