Measles is transmitted through respiratory droplets and person-to-person contact.

Choice A rationale:

Measles is not transmitted through contaminated water sources. It is a highly contagious viral infection that primarily spreads through respiratory droplets when an infected person coughs or sneezes.

Choice B rationale:

Measles is not transmitted through contact with infected animals. It is a human-specific virus and does not infect animals.

Choice C rationale:

This is the correct choice. Measles is primarily transmitted through respiratory droplets when an infected person coughs or sneezes. It can also spread through direct contact with respiratory secretions or airborne particles.

Choice D rationale:

Measles is not transmitted through exposure to contaminated food. The virus is not foodborne, and the main mode of transmission is person-to-person through respiratory droplets.