From the top of a hill 240 m high, the angles of depression of the top and bottom of a pole are 30° and 60°, respectively. The difference (in m) between the height of the pole and its distance form the hill is:

• A. 80(√3 - 1)
• B. 120 (2 - √3)
• C. 120 (√3 - 1)
• D. 80 (2 - √3)