Answer: C. 45
Explanation:
Given : Total number of choices of topics =15
Total choices of presentation methods= written report, oral presentation, or making a game.
Total number choices of presentation methods= 3
Now , by Fundamental Counting Principle , the number of different project combinations are possible would be
(choices of topics) x (choices of presentation methods)
(15) x (3) =45
Therefore , the number of different project combinations are possible= 45
Hence, the correct option is C. 45 .