Answer:
B. Photosynthesis will happen slower/less
Explanation:
Option B is the possible short-term effect on photosynthesis when the sun's rays are partially blocked.
Photosynthesis is the process whereby plants manufacture their own food with the use of sunlight and carbon dioxide. When this occurs, (energy in form of glucose) and oxygen are produced. The oxygen is released for animals to use.
Photosynthesis makes use of sunlight. But if sunlight is partially blocked, the process by which photosynthesis occurs becomes slow or less. This is because as the sunlight is partially blocked, there is no adequate supply of sunlight to carry out photosynthesis.