In which reaction is the final product $Ph-C \equiv CH$?

• A
  $Ph-C(Br)_2-CH_3$ $\xrightarrow[\text{Mineral oil, heat}]{2NaNH_2}$ $\xrightarrow{NH_4Cl}$
• B
  $C_6H_5-CH=CH_2$ $\xrightarrow[CCl_4]{Br_2}$ $\xrightarrow[\text{Mineral oil, heat}]{3NaNH_2}$ $\xrightarrow{NH_4Cl}$
• C
  $C_6H_5-C(=O)-CH_3$ $\xrightarrow{PCl_5}$ $\xrightarrow[\text{Mineral oil, heat}]{3NaNH_2}$ $\xrightarrow{NH_4Cl}$
• D
  All of these