7
Jean is doing an experiment to find out whether mold grows faster on certain types of bread. She has eight different types of bread. She places them out on the same counter. Every day, Jean examines each loaf of bread for signs of mold growth. She then records her observations.

Which variable is Jean changing in the experiment?
A.
the type of bread
B.
the type of mold
C.
the amount of time each loaf is left out
D.
the amount of light each loaf receives