Answer:
Mystery.
Step-by-step explanation:
'The Tide Rises, The Tide Falls' is a poem written by Henry Wadsworth Longfellow. The poem predicates the iterating cycle of life presented through the rise and fall of the tide.
In the given verses, the author has used imagery device to evoke a sense of mystery. The poet has tried to evoke mysterious and haunted images by using the words such as 'the sea in the darkness calls.' And depicting the complete darkness and a time of full darkness.
Thus the correct answer is the third option.