Because clients who are just getting sick can be contagious without showing any signs of infection, they are considered to be:

The correct answer is C. asymptomatic.

Asymptomatic individuals are those who carry a disease but do not show symptoms or signs of infection. This means they can still be contagious and potentially spread the illness to others, even if they themselves do not feel sick. If you have more questions or need further assistance, feel free to reach out!