What was once a pond filled with bass fish on Tom's parent's farm is now significantly decreased in population. Which of the following could explain the reason for the decrease in the bass population?
a. Drainage from sugar farms has decreased the reproductive rate in fish.
b. Fertilizer runoff contains endocrine disruptors that affect reproduction in fish.
c. Increased photosynthesis causes competition for food resources.
d. Planting sugar cane along the riverbank has created a mass emigration of fish