13. A mixture of oct-1-yne, oct-2-yne, and oct-3-yne was hydrogenated in the presence of a platinum catalystuntil hydrogen uptake ceased. If one assumes that the hydrogenation went to completion, how manydifferent eight-carbon hydrocarbons were produced?
(A) 1
(B) 2
(C) 3
(D) 6
(E) 8