Answer:
The correct option is A. Higher stomatal density would increase the amount of carbon incorporated into RuBP.
Step-by-step explanation:
Stomata can be described as tiny structures present in the leaves of a plant which open and close to allow gaseous exchange. They might be present in the stems of some plants as well. The opening and closing of the stomata is controlled by a specialized type of cells which are known as the guard cells.
Option A is correct because it is the only option that correctly relates the function of the stomata.