The answer is D. Pertinent comes from the word pertain/pertaining, which means relevant.
The answer is <span>The sailor's negative experiences with the sea have led him to develop this perspective.
The sailors has faced too many death of the people around him. Because of this experience he saw the sea as some sort of enigmatic force that would cruelly claimed lives if we ever underestimate it</span>
The second statement is correct
Tranquil is the answer. Serene means calm. Therefore, tranquil has to be more intense.
