Ryan's mom is taking a nutrition class at a local college. She enters the foods Ryan typically eats into the USDA's Super Tracker tool. The results indicate that Ryan is eating 1600 kcalories in one day. Given his recommended kcalorie intake, how many pounds will Ryan gain in three months (90 days) if he continues to consume this many excess kcalories per day?

A. 3.4 pounds
B. 5.1 pounds
C. 7.7 pounds
D. 10.3 pounds