What could happen if Susan stopped taking her antibiotics when she felt better, instead of taking them for the length of time directed by her doctor?

a
The bacteria could cause her immune system to stop producing the antibodies to fight any strain of bacteria.
b
The bacteria could cause her immune system to build a resistance to that strain of bacteria forever.
c
The bacteria could be destroyed by the antibiotic, and that particular strain would never appear again.
d
The bacteria could turn into a superbug, as it builds up a resistance to the antibiotic over time.

d

The bacteria could turn into a superbug, as it builds up a resistance to the antibiotic over time. This can make the infection harder to treat in the future and potentially spread to others. It is important to finish the full course of antibiotics as prescribed by a doctor to completely eradicate the infection and prevent the development of antibiotic-resistant bacteria.