Final answer:
If fewer people get the flu or recover fast, the prevalence rate will decrease option (c).
Step-by-step explanation:
If fewer people get the flu or recover fast, the prevalence rate will decrease option (c). The prevalence rate refers to the proportion of individuals in a population who have a specific condition at a given time. So, if fewer people have the flu or recover quickly, there will be a decrease in the number of individuals with the flu in the population, resulting in a lower prevalence rate. For example, if the prevalence rate was initially 10%, and fewer people get the flu, it may decrease to 5%.