Context: The passage below describes an experiment.

Ava baked bread for a bakery. She stored her bread in clear bins in the back of the bakery, but she sometimes found mold growing on the bread. Ava wondered if less mold would grow if she stored her bread in dark bins.
Ava covered half of the clear bins in dark paper. She left the rest of the bins uncovered. She put an equal amount of bread in each bin. Every day for two weeks, she counted how many loaves of bread in each bin had mold.
Figure: moldy bread.
In this experiment, which were part of a control group?
A. the loaves of bread in bins covered with dark paper
B. the loaves of bread in bins with no covering
Select the correct answer from the provided options and reply with the letter associated with it.

B