Answer:
A
Step-by-step explanation:
Bacteria are treated using antibiotics. Antibiotics disrupts their ability to reproduce, allowing the body's immune system to eradicate the bacteria quickly.
However, if antibiotic treatment is not completed fully, some bacteria may survive the antibiotic treatment and develop immunity due to certain bacteria accumulating enough mutations or undergoing homologous recombination of antibiotic resistant genes from other bacteria strains, causing resultant bacteria to be resistant to that particular type of antibiotic. As time progresses and the types of antibiotic used differs in strength and type, the cycle repeats and the final resultant strain of bacteria is one that is considered a superbug whereby antibiotics are no longer efficient to help the body eradicate the bacteria.