The rise of methicillin-resistant Staphylococcus aureus (MRSA) can be considered to be an example of artificial selection because
A) humans purposefully raise MRSA in large fermenters in an attempt to make the bacteria ever-more resistant.
B) S. aureus is cultivated by humans to replenish the soil with nutrients.
C) humans synthesize methicillin and create environments in which bacteria frequently come into contact with methicillin.
D) Humans are becoming resistant to bacteria by taking methicillin.
