The correct answer is
“Sea mountains form a thriving ecosystem of underwater plants and animals, some of which have never been documented by scientists.”
B) Deride
Deride means to ridicule or mock
Therefore it is the most suitable option for the context of the sentence.
In the passages, the author gives a few details that develop the idea that establishing a colony at Roanoke was going to be difficult because of the Native Americans. The author says, "not all relations between the colonists and the Native Americans were friendly." He expands on this when he states, "some Native Americans were still angry about the colonists' presence and threatened to do battle." The Native Americans who did not want the English colony at Roanoke made it difficult to establish a colony.
Reasonable guess (4th option)
