TRUE IS YOUR CORRECT ANSWER.
The answer is (2)
(1) and (3) are obviously wrong.
If thy stop reproducing then the whole population could die and (3) is just crazy.
(4) is also inncorrect because of they run out of foo then they all will die.
(2) is the one that makes the most sense
B) Exocytosis.
Hope this is of help to you, and happy studying~!
~{Isle of flightless birds}
Demonstrative pronoun is the answer.
