During a Provincial Election,a Campaign Manager Wishes to Know How

During a provincial election,a campaign manager wishes to know how well her candidate will do in the upcoming election."Who" should be identified in the sampling frame?

A) All eligible voters in the constituency
B) All individuals in the constituency
C) All eligible voters that will vote on election day in the constituency
D) All individuals over 18 years of age in the constituency
E) All individuals that voted in the last election in the constituency