Powerprep 2 Question

[fbmagnumopus]

Hi I dont understand for this question, why the answer is A and not B given that the passage starts off talking about the disappearance of the sea cow by 1768.

Here's the question and the passage

http://postimg.org/image/u76p0xuq9/

[tommywallach]

The question is about kelp, not sea cows. : )

-t

[fbmagnumopus]

Oh darn it! LOOL That was a stupid question. Haha thanks, at least now I know how careless I can be !!

[tommywallach]

It happens to the best of us! : )

-t