A Man Infected with a Viral Respiratory Infection Sneezes and Releases

A man infected with a viral respiratory infection sneezes and releases tiny droplets containing viral particles.Two minutes later,a woman breathes in some of these tiny droplets and becomes infected by the same viral infection.The movement of this virus from one individual to another is best described as the

A) etiologic agent.
B) reservoir.
C) mode of transmission.
D) host.