A Magazine Publisher Always Mails Out a Questionnaire Five Months

A magazine publisher always mails out a questionnaire five months before a subscription ends.This questionnaire asks its subscribers if they are going to renew their subscriptions.On average,only 3% of the subscribers respond to the questionnaire.Of the 3% who do respond,an average of 44% say that they will renew their subscription.The value 44% is known as what?

A) The sampling method
B) The bias
C) The population
D) The sample statistic
E) The population parameter of interest