Answer:
D. Many of the bacteria living in these areas are antibiotic-resistant.
Explanation:
Antibiotic resistance occurs when a bacteria develops a resistant gene in order to be less susceptible to a medicine in use.
The more the bacteria is exposed to different medicine the more the resistance. When these bacteria infect humans, they tend to be difficult to treat.
In a surgical ward where antibiotic are heavily used, there is a high chance many bacteria living in the area are antibiotic resistant