请教一道英文阅读理解题,求思路和答案,
原文：...After a time Charles's returning interest in living showed itself in the simple form of hunger.With some difficulty,owing to the water in the boat,he explored its stores and found food and water in air-tight tins.
The first sign of Charles's renewed desire to live was that he
A.started to look for food and waster.
B.was able to explore the boat.
C.found he needed to move about
D.began to feel the need for food.