Final answer:
The most appropriate antibiotic to treat M. pneumoniae is Azithromycin.
Step-by-step explanation:
The most appropriate antibiotic to treat a person with M. pneumoniae is Azithromycin. This antibiotic is effective against the bacterium and targets bacterial ribosomes. It is commonly used to treat respiratory tract infections caused by M. pneumoniae. Other antibiotics such as ampicillin, doxycycline, and ciprofloxacin may not be effective against this specific bacterium or may have resistance issues.