Answer: a drug-resistant bacteria
Explanation: in the passage, we can read that:
"Campylobacter is estimated to cause approximately 1.3 million infections, 13,000 hospitalizations, and 120 deaths each year in the United States. "
from this, we can expect that the campylobacter is some form of bacteria or virus.
" The CDC is seeing resistance to ciprofloxacin in almost 25 percent of campylobacter tested and resistance to azithromycin in about 2 percent. "
And here we can see that the campylobacter shows resistance to some drugs.
Then the option that makes sense is:
2) a drug-resistant bacteria