The percentage of a hunter-gatherer society’s diet provided by hunting versus gathering was mostly determined by a. the climateb. the types of preyc. hunting skilld. the size of the human population

The correct answer is option a, that is, the climate.

All the mentioned options to some extent affect the percentage of hunter-gatherer society's diet, however, the most essential of them is the climate. The climate predicts that how much prey is accessible, and what kind of prey it is. It also determines that whether it is hard or easy to hunt them down. This signifies that the climate affects the other mentioned options too.

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i'm pretty sure its b i might be wrong though!