C) 2,2-dimethyl-3-heptyne

how to draw

First you draw a straight chain containing 7 carbon atoms

Then you add a triple bond next to the third carbon atom because it's alkyne

You will add 1 CH3 above the second carbon atom and one below so it will be 2,2-dimethyl

So it will be:

CH3

|

CH3-C _CH2-CH2-CH2-CH2-CH3

| =

CH3