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Bacteria can illustrate evolution occurring at a rapid rate. This is done by

A. Growing bacteria in a petri dish and making observations under a microscope
B. Comparing bacterial growth when interacting with antibiotics
C. Repeatedly exposing bacterial sample to the same antibiotics to see if the resistance changes.
D. Bacteria are single-celled organisms and do not evolve over time.

I think its B but im pretty sure im not right. Please help?