Answer:
C. It makes getting water easier and quicker for the cactus.
Step-by-step explanation:
Cacti have roots that are perfectly adapted to the dry and hot climate of a desert. Some of them are very long to reach the water underground, providing them enough water. Some have roots that are very extensive and shallow, this is because they have a different strategy, they take their water mostly from brief showers, and their roots allow them to maximize the amount of water they can get. A corky layer on the roots also helps to prevent water loss.