Explain why $2,2,5,5-$tetramethylhex$-3-$yne can't be made using acetylide anions. Select the single best answer.

The $3$ alkyl halide is too crowded for nucleophilic substitution.

It would form the substitution product.

The $1$ alkyl halide is too crowded for nucleophilic substitution.

It has a terminal alkyne.

The $2$ alkyl halide is too crowded for nucleophilic substitution.

It has an internal alkyne.