Context: Jacob starts to make a sandwich, but he sees mold on the bread! He wonders what factors affect how mold grows on bread. So, he decides to design an experiment. He has the following supplies available:
two loaves of white sandwich bread
a small plastic bag
a large plastic bag
a refrigerator
Using only these supplies, which question can Jacob investigate with an experiment?
A. Does white sandwich bread grow visible mold in fewer days if the bread is stored in a paper bag or in a plastic bag?
B. Does white sandwich bread grow visible mold in fewer days if the bread is stored inside or outside the refrigerator?
C. Does white or whole wheat sandwich bread grow visible mold in fewer days?
From the given choices, select the correct answer and reply with the letter of the chosen option.

B