Which problems can be solved by preforming this multiplication?

3/4 x 24
select each correct answer.↓
a. aisha baked 24 muffins. she gave 3/4 of the muffins to her friends. how many muffins does she have left?
b. there was 24 questions on a test. three fourths of the questions were science questions. how many questions were science questions?
c. matthew has 24 inches of green ribbon and 3/4 inch of yellow ribbon. how much ribbon does he have in all?
d. kiki has 24 marbles. she put 3/4 of the marbles in a jar. how many marbles did she put in the jar? than you answer. you will get 20 points answer.