Answer :
I believe a. would be the question that could be answered by conducting a scientific experiment, because you can control the variables.
Answer:
A.Which type of bread goes moldy the fastest?
Explanation:
You can moisture the bread , seal it in a zip lock bag and place it in the freezer for some days. The mold will eventually grow. Be sure not to touch it and use gloves. Molds can be allergic to some.