Can someone please help me out with this question?

Answer:
It is just right
Step-by-step explanation:
Kermit's fav = 15 tea bags every 2 liters = 15/2 = 7.5 teabags per liter
Peggy made 90 teabags in 12 liters = 90/12 = 7.5 teabags per leter
Hence peggy used the same teabags per liter than kermit's favorite. It is just right.
edit: calculation error. corrected.
Your answer would be C:Just right.
Because:
2 liters of water = 15 tea bags
15/2 = 7.5 tea bags
Peggy needs to make 12 liters
12 x 7.5 = 90 tea bags
Conclusion:
Peggy's 12-liter batch of iced tea with 90 tea bags is JUST RIGHT.
Hope helps!-Aparri