What features or variables of the plant leaves might affect the rate of photosynthesis?

The features that might affect how leaves process and perform rate of photosynthesis is determined by its surface area, chlorophyll and stomata.

The surface area of the leaf influences its performance to photosynthesis through the amount of light captured by it which is needed for photosynthesis to occur. As well chlorophyll which enables the leaf to absorb light and be processed. Lastly, stomata which is responsible for carbon dioxide and gas exchange.

its temperature is increasing. this causes molecular vibrations to increase.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.