As observed from the top of a lighthouse, 42 m high abovesea-level, the angle of depression of a ship sailing directly towards it changes from $$30^\circ$$ to $$45^\circ$$. The distance travelled by the ship during the period of observation is:

A

$$42(1 - \sqrt{3})$$

B

$$42(\sqrt{3} + 1)$$

C

$$42(\sqrt{3} - 1)$$

D

$$42$$