Question

Why do sharks swim non-stop? The sharks swim non-stop because they _________.

• A. do not follow other sharks
• B. are restless creatures
• C. would drown if they don't swim
• D. mark their territories

Answer 1

The correct option is C would drown if they don't swim

As mentioned in the line, "Therefore, if they stopped swimming they would sink.", sharks need to swim non-stop, because if they stopped swimming, they would sink (drown).
The same is mentioned in option C, hence it is correct.
Option A: This does not state the required reason.
Option B: Similarly, this line is neither mentioned nor implied by the given passage.
Option D: This is true for some species of sharks, that they are territorial. But it does not give the reason for why they swim non-stop.
Hence options A, B and D are incorrect.