Which of the following would not be a contributing factor to the life span of goldfish in a backyard pond?

a. the pH level of the pond water.

b. the size of the goldfish

c. the food source availability in the pond

d. the temperature of the pond water

b. the size of the gold fish

The option that would not be a contributing factor to the life span of goldfish in a backyard pond is B. the size of the goldfish. I don't see how their size would affect the life span of a fish, whereas the pH levels, the food availability, as well as the water temperature can either increase or decrease how much these fish can live.