Answer:
d. (16/24) * 100%
Explanation:
The infection rate =( Number of infected people/ total number of people) * 100%
After the end of round 3
Infection rate = (8/24)*100%
After the end of round 4, since no one is infected more than once
Infection rate = 2* (8/24)*100%
Infection rate = (16/24) * 100%