A news reporter wants to estimate the percentage of registered voters who will vote for a particular candidate in an upcoming election. Which statement describes a method that will help him accurately estimate this percentage?

He could take a random sample of registered voters, and then calculate the percentage of the sample who will vote for the particular candidate.

He could ask employees at the newspaper which candidate each will vote for, and then calculate the percentage who will vote for the particular candidate.

He could contact every resident in the town, ask whether the resident will vote for the particular candidate, and then calculate the percentage of residents who say they will vote for the particular candidate.

He could ask his readers to respond to a survey that asks which candidate the reader will vote for and then calculate the percentage of people who say that they will vote for the particular candidate.
PLEASE HELP IF I DON'T ACE THIS TEST I WILL FAIL I DON'T WANT THAT PLEASE.