Correct Answer - B
`C_(5)H_(8)` can have the following structure with one triplee bond.
`underset("Pent-1-yne")(CH_(3)-CH_(2)-CH_(2)-C)-=CH,underset("Pent-2-yne")(CH_(3)CH_(2)-C-=C-CH_(3))`
`underset("3-Methylbut-1-yne")(CH_(3)-underset(CH_(3))underset(|)(C)H-C-=CH)`