You are given a question or fill-in-the-blank question, two answer options (Option1 and Option2) and an Explanation. Your task is to find the correct answer (return the string of the correct option, not option1/2) for the given question from the given options and using explanation.

Q: Question: As a diver goes into shallow water, the water gets 
 Option1: warmer 
 Option2: colder. 
 Explanation: Water also gets colder as you go deeper.

A: warmer
****
Q: Question: Mary loves to dive in the ocean. What will happen to the water as she dives deeper? 
 Option1: darker 
 Option2: lighter 
 Explanation: The deeper you go, the darker the water gets.

A: darker
****
Q: Question: If a herd of elephants is living happily in a forest and a group of humans then decides to move in, what happens to the elephants? 
 Option1: they decrease in number 
 Option2: they increase in number 
 Explanation: The forest habitat of elephants has also decreased in size due to humans moving in, so the numbers of the elephants have decreased.

A:
they decrease in number
****