关于TPO14阅读另一题目求解

huaimingyunUID: 2943676

不好意思，我又需要帮助了，这也是TPO阅读14里面的一道题目，我觉得答案不是很明确，希望大家一起探讨哈
Which of the following statements about the availability of water in the Mayan homeland is supported by paragraph 3?
 AThe construction of wells was an uncommon practice in both the north and the south because it was too difficult to dig through the karst.
 BIn most areas in the north and the south, rainwater was absorbed directly into the porous karst.
 CThe water table was an important resource for agriculture in both the north and the south of the Yucatan Peninsula.
 DThe lack of surface water in both the north and the south was probably due to the fact that most of it was quickly used up for agricultural purposes.
参考段落：
Although southern Maya areas received more rainfall than northern areas, problems of water were paradoxically more severe in the wet south. While that made things hard for ancient Maya living in the south, it has also made things hard for modern archaeologists who have difficulty understanding why ancient droughts caused bigger problems in the wet south than in the dry north. The likely explanation is the an area of underground freshwater underlies the Yucatan Peninsula, but surface elevation increases from north to south, so that as one moves south the land surface lies increasingly higher above the water table. In the northern peninsula the elevation is sufficiently low that the ancient Maya were able to reach the water table at deep sinkholes, the Maya would have been able to get down to the water table by digging wells up to 75 feet (22 meters) deep. But much of the south lies too high above the water table for cenotes or well to karst, a porous sponge-like limestone terrain where rain straight into the ground and where little or no surface water remains available.
题目答案是B，我选的是C，有没有遇到同样问题的同学呀？求分析