Answer:
The correct answer is option a, that is, transported water from distant mountains to flood the region.
Step-by-step explanation:
A central valley of California known as San Joaquin Valley experiences drought because of the groundwater depletion that took place in the 1920s resulting in the sinking of the valley by almost 28 feet. As this place largely relies upon the huge volumes of water, the valley now has turned into an arid and semi-arid region. This made the state water project to divert the surface water into the valley so that the issue can get resolved.