Match Column I with the major product in Column II. Column I: (1) $\mathrm{HBr}$ + buta-1,3-diene at $-80{}^{\circ }\mathrm{C}$; (2) the same, equilibrated at $40{}^{\circ }\mathrm{C}$; (3) naphthalene + conc. $\mathrm{H}{}_2\mathrm{SO}{}_4$ at $80{}^{\circ }\mathrm{C}$, short time; (4) naphthalene + conc. $\mathrm{H}{}_2\mathrm{SO}{}_4$ at $160{}^{\circ }\mathrm{C}$, long time. Column II: (P) naphthalene-2-sulfonic acid; (Q) 1-bromobut-2-ene; (R) naphthalene-1-sulfonic acid; (S) 3-bromobut-1-ene.

1. A1-Q, 2-S, 3-R, 4-P
2. B1-Q, 2-S, 3-P, 4-R
3. C1-S, 2-Q, 3-R, 4-P
4. D1-S, 2-Q, 3-P, 4-R