Match the species in List I with the property in List II. List I: P = meso-tartaric acid; Q = (2R,3R)-tartaric acid; R = one enantiomer of penta-2,3-diene; S = (+/-)-tartaric acid (racemic). List II: 1 = achiral, has an internal plane of symmetry; 2 = chiral, has two stereocentres and a $C_2$ axis; 3 = chiral, has no stereocentre; 4 = composed of chiral molecules but optically inactive due to external compensation.

1. AP-1, Q-2, R-4, S-3
2. BP-1, Q-2, R-3, S-4
3. CP-2, Q-1, R-3, S-4
4. DP-4, Q-2, R-3, S-1