As observed from the top of a lighthouse, 45 m high above the sea-level, the angle of depression of a ship, sailing directly towards it, changes from 30° to 45°. The distance travelled by ship during the period of observation is: (Your answer should be correct to one decimal place).

• A. 36.9 m
• B. 32.9 m
• C. 33.4 m
• D. 24.8 m