Q. The North Atlantic Sea Route remains ice-free throughout the year. Which of the following reasons explains this?

1. North Atlantic Drift's warming influence
2. Low salinity of the Arctic Ocean
3. Prevailing westerly winds

Select the correct option using the codes below:
Answer: Only 1 and 3
Notes: The North Atlantic Sea Route stays ice-free mainly due to the warm North Atlantic Drift (a branch of the Gulf Stream) and prevailing westerly winds, both of which raise sea and air temperatures. Low salinity of the Arctic Ocean does not play a significant role in this effect. Thus, only statements 1 and 3 are correct.