Which of the following polymerisation reactions leads to the formation of neoprene?

• A
  $n CH_2=C(Cl)-CH=CH_2 \xrightarrow{AlCl_3}$
• B
  $n CH_2=C(CH_3)-CH=CH_2 \xrightarrow{(C_6H_5CO)_2O_2}$
• C
  $n CH_2=C(Cl)-CH=CH_2 \xrightarrow{(C_6H_5CO)_2O_2}$
• D
  $n CH_2=C(CH_3)-CH=CH_2 \xrightarrow{AlCl_3}$