Premise: "Small child wearing a yellow life jacket walks in the sand with their boogieboard on their head."\nHypothesis: "A boy prepares to ride his boogieboard in the ocean."\nDo we know that the hypothesis entailed by the premise?
Let's think step by step.
it is not possible to tell
The child might not be a boy.

Not everyone who carries a board prepares to ride it.

There might not be an ocean.

.

Thus, the answer is it is not possible to tell