Jenny maximizes her utility when she spends her $100 of income on 10 comic books and 5 video games. If the marginal utility of the 10th comic book is equal to 25, and the marginal utility of the 5th video game is equal t 50, what are the prices of comic books and video games?

A) Comic books cost $25 each, video games cost $45 each

B) Comic books cost $2.50 each, video games cost $10 each

C) Comic books cost $5 each, video games cost $10 each

D) Comic books cost $2 each, video games cost $16 each

Please explain why the answer is C. Thank you