Answer:
Option e
Explanation:
Given that the city council hired three college interns to measure public support for a large parks and recreation initiative in their city
The interns mailed surveys to 500 randomly selected participants in the current public recreation program. They received 150 responses
Here the sample frame is the entire population for which the test was conducted.
The 500 people are the sample surveyed and 150 are those who responded
The sample frame would be all members of the community because by sample frame we mean a list of all the items in your population. It's a complete list of everyone or everything you want to study
So Option E is right.