Answer:
b. Applicants for the federal funding
Explanation:
Sampling
This is a common statistics practice, when we want to study something from a population, we find a sample of this population.
For example:
I want to estimate the proportion of New York state residents who are Buffalo Bills fans. So i ask, lets say, 1000 randomly selected New York state residents wheter they are Buffalo Bills fans, and expand this to the entire population of New York State residents, which is the population of interest.
In this question:
She takes a sample of applicants for the federal funding from the US, which means that the population of interest is all applicants for the federal funding in the US. The correct answer is given by option b.