We have to know the number of alkyne molecule with molecular formula C₈H₁₄ which can afford only one carboxylic acid when ozonolyzed.
The number of alkyne molecule with molecular formula C₈H₁₄ which can afford only one carboxylic acid when ozonolyzed is one.
Those alkyne only can give only one carboxylic acid on ozonolysis which contains C≡C bond in the middle position.
There are possibility of only one alkyne with equal number of carbon atom with respect to C≡C bond with molecular formula C₈H₁₄. Any other alkyne with same molecular formula will give at least two carboxylic acid.