Of the students in the Science Club, what percentage are seniors?

Correct answer: B. 40%

The correct answer is 40%. The question asks for the percentage of students *in the Science Club* who are seniors. First, find the total number of students in the Science Club by adding the number of juniors and seniors in that club: 18 + 12 = 30. Next, find the number of seniors in the Science Club from the table, which is 12. To find the percentage, divide the number of seniors in the Science Club by the total number of students in the Science Club and multiply by 100: (12 / 30) * 100 = 0.4 * 100 = 40%. A is incorrect. This is the percentage of *all students surveyed* who are seniors in the Science Club. The total number of students is 18 + 7 + 12 + 3 = 40. (12 / 40) * 100 = 30%. C is incorrect. This is the percentage of Science Club members who are juniors, not seniors: (18 / 30) * 100 = 60%. D is incorrect. This is the percentage of *seniors* who are in the Science Club. The total number of seniors is 12 + 3 = 15. (12 / 15) * 100 = 80%.