Which one of the following reactions will give a product that has zero net dipole moment

A

Hex-3-yne with $$\text{H}_2$$ - Pd/C

B

Hex-3-yne with Na in liquid ammonia

C

Hex-2-yne with $$\text{H}_2$$ - Pd/C

D

Hex-2-yne with Na in liquid ammonia