The correct option is A They can smell their prey.
Option D: They can smell their prey.
This line is indicated by the sentences: "Sharks are good at following scents across thousands of miles in the
ocean. This helps them to track down their prey and arrive at the
precise location. They seem to follow a scent like hunting dogs do and
this has earned them the name, 'hounds of the sea'"
The line given above means that sharks have an extraordinary sense of smell, through which they can smell their prey. This gives them the name 'hounds of the sea'.
Hence option D is correct.
Option A: They bother others in the sea.
This line does not justify the nickname 'hounds of the sea'. It isn't given in the passage. Hence A is incorrect.
Option B: They are good hunters.
This line is a general characteristic of a shark and is not the reason behind the nickname that is mentioned.
Option C: They are pursued by others.
This line isn't given or implied in the passage, and hence, isn't the reason required.
So, option C is not right.