Correct Option (C)
The passage explicitly states that unchecked environmental degradation and deforestation will lead to "soil erosion by wind and water," which directly results in the depletion of soil resources. Furthermore, it highlights that areas once characterized by "lush green forests with perennial streams and springs" now exhibit "brown earth, bare of vegetation, without any water in the streams and springs except in the rainy season." This directly indicates a lack of water necessary for cultivation.
Incorrect Options:
The passage emphasizes the unsuitability of land for agriculture due to environmental degradation, stating that agriculture "will gradually become impossible." However, it does not mention a physical shortage of land for the common man. The issue presented is the degradation of land quality and water availability, rendering existing land unproductive for cultivation, rather than a reduction in its physical extent or accessibility.