Cana buys candy for her birthday party at a supermarket where there is no sales tax. She buys lollipops that cost $0.49 each and gummies that are sold by the pound. In total, Cana paid $9.73 for 16 lollipops and 4.2 pounds of gummies. What is the cost per pound of the gummies?

A: $4.50
B: $2.20
C: $0.90
D: $0.45