Question

During World War I, the American government arrested_____________ who publicly opposed the war effort.a. Dissidentsb.Draft Dodgersc.Politicians

Answer 1

They  didn't arrest politicians, so we can reject this answer.

now, both draft dodgers and dissidents were arrested in the US during WW1, so which one of the two is the correct answer? 

The better answer is "dissidents" because it corresponds to the definition of "opposed the war effort"