Max has a group of goldfish in his tank at home. He notices that they are struggling a bit. Max wants to increase their rate of cellular respiration because he thinks that it would help them to survive. Which of the following actions would potentially increase the rate of cellular respiration in the goldfish?
A. Reducing the amount of food placed in the tank
B. Increasing the amount of oxygen in the tank
C. Reducing the amount of sunlight that hits the tank
D. Increasing the amount of carbon dioxide in the tank