Leo: Premise: "A young man with brown hair wearing a green outfit is rowing with an oar."
Hypothesis: "A man in a green outfit is rowing a boat alone."
Do we know that the hypothesis entailed by the premise?
Mei: OK, So, let's think first...
Me:
A young man with brown hair wearing a green outfit is rowing with an oar does not necessary that he is rowing a boat alone.
Thus, the answer is it is not possible to tell.