The dibromo compound [P] (molecular formula : $$C_{9}H_{10}Br_{2}$$) when heated with excess sodamide followed by treatment with dilute HO gives [Q]. On wanning [Q] with mercuric sulphate and
dilute sulphuric acid yield [R] which gives positive Iodofonn test but negative Tollen's test. The compound [P] is:

A

B

C

D