A tree casts a shadow that is about 15ft. long. Javier, who is about 5.5 ft. tall, is standing near the tree. Javier's shadow is about 4.5 ft. long. What is the estimated height, t, of the tree?

A. 9.6 ft.
B. 12 ft.
C. 15 ft.
D. 18 ft.