Which among the following reaction sequence is useful to synthesize the unsymmetrical alkyne like  ${\text{CH}}_{\text{3}}-\text{C}\equiv \text{C}-{\text{CH}}_{\text{2}}-{\text{CH}}_{\text{3}}$

• A

  propyne, Sodamide, iodomethane 

• B

  propyne, Sodamide, iodoethane 

• C

  1, 2–dichloroethane, potassium hydroxide, iodomethane 

• D

   Ethyne, Sodamide, 1, 2–dichloroethane