Which among the following is called Berthelot's reaction?

• A

  ${\text{2C + H}}_{\text{2}}\underset{{\text{1200 }}^{\text{o}}\text{C}}{\overset{\text{electric arc}}{\to }}$

• B

  ${\text{6CH}}_{\text{4}}{\text{ + O}}_{\text{2}}\underset{ }{\overset{\text{controled oxidation}}{\to }}$

• C

  ${\text{CaC}}_{\text{2}}{\text{ + H}}_{\text{2}}\text{O}\underset{ }{\overset{ }{\to }}$

• D

  ${\text{Br}}_{\text{2}}{\text{CH}}_2{\text{CHBr}}_{\text{2}}\text{ + Zn}\underset{\Delta }{\overset{ }{\to }}$