Rhizopus Stolonifer (Black Bread Mold)is More Likely to Grow on Home-Baked

Rhizopus stolonifer (black bread mold) is more likely to grow on home-baked bread than on store bought bread.The most likely reason for this is

A) the store bought bread has been refrigerated,while the home-baked bread has not.
B) home-baked bread is more likely to contain chemical preservatives than store bought bread.
C) store bought bread is more likely to contain chemical preservatives than home-baked bread.
D) home ingredients are more likely to contain fungal spores.
E) home-baked bread will contain more nutrients than store bought breads.