Respuesta :

I believe the answer is: all high school seniors at Eric's school

In survey, population refers to the group of subjects that can be used as a source to collect the data for the survey.
From the description above, eric wants to find out the 
most popular after-school activity among high school seniors.
This means that all high school seniors' opinion could be used as the data for this question.

Answer:

all high school seniors at Eric's school

Explanation:

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