A researcher performs an experiment to study the effect of magnesium chloride, a component of fertilizer, on fish embryos. For the study, fish eggs are placed in two petri dishes labeled X and Y. In petri dish X, the researcher adds 100 mL of salt water and 6 g of magnesium chloride. Petri dish Y has only 100 mL of salt water and no magnesium chloride. After two days, the embryos developing in petri dish X have only one eye, while the embryos developing in petri dish Y have two eyes. Which conclusion does this experiment support? A. Salt water in the environment affects the development of the fish embryos.

B. Fertilizers in the environment affect the development of the fish embryos.

C. Salt water in the environment affects the rate of hatching for the fish embryos.

D. Fertilizers in the environment affect the rate of hatching for the fish embryos.