Which among the following will give 3,3–dimethylbut–1–yne on reaction with  NaNH2/$∆$

1,2–dibromo–3,3–dimethylbutane undergo dehydrohalogenation reaction in the presence of ${\text{NaNH}}_{\text{2}}{\text{ in liquid NH}}_{\text{3}}$  and forms 3,3–dimethyl but–1–yne.

2,2–dibromo–3,3–dimethylbutane undergo dehydrohalogenation reaction in the presence of ${\text{NaNH}}_{\text{2}}{\text{ in liquid NH}}_{\text{3}}$ and forms 3,3–dimethylbut–1–yne.