B Remi should research amusement parks so that he is able to make an informed opinion about the biggest roller coaster before he begins to write his paper. This will allow him to gather accurate and reliable information about different amusement parks and their roller coasters, which will help him to form a well-supported and knowledgeable viewpoint. An uninformed opinion, on the other hand, would be based on guesswork or limited knowledge and would not be as effective in supporting his argument.