A radar operator on a ship discovers a large sunken vessel lying parallel to the ocean surface, 150 m directly below the ship. The length of the vessel is a clue to which wreck has been found. The radar
operator measures the angles of depression to the front and back of the sunken vessel to be 52º and 70°.
How long, to the nearest tenth of a metre, is the sunken vessel?

A 172.8 m
B 172.3 m
C 173.3 m
D 171.8 m