In Statistics, the Population Is the Group of Interest; a Sample

In statistics, the population is the group of interest; a sample is a subset of the population. The sample should be representative of the population and large enough to minimize chance differences between the population and the sample.
-A geneticist is interested in whether asthma is caused by a mutation in the DS112 gene. The geneticist collects DNA from 120 people with asthma and 100 healthy people and sequences the DNA. She finds that 35 of the people with asthma and none of the healthy people have a mutation in the DS112 gene. What is the population in this study?

A) The 120 people with asthma
B) The 100 healthy people
C) The 35 people with a mutation in their gene
D) All people with asthma