Use of Antibiotics in Animal Feed Leads to Antibiotic-Resistant Bacteria

Use of antibiotics in animal feed leads to antibiotic-resistant bacteria because

A) the antibiotics kill susceptible bacteria, but the few that are naturally resistant live and reproduce, and their progeny repopulate the host animal.
B) bacteria from other animals replace those killed by the antibiotics.
C) the antibiotics persist in soil and water.
D) the antibiotics cause new mutations to occur in the surviving bacteria, which results in resistance to antibiotics.
E) the few surviving bacteria that are affected by the antibiotics develop immunity to the antibiotics, which they pass on to their progeny.