Farmer Brown Lives in a Semi- Arid Part of the United

Farmer Brown lives in a semi- arid part of the United States with numerous small lakes associated with glacial deposits of sand and gravel. He decides he needs to irrigate part of his land and drills a shallow well 100m from his property line with Farmer Smith who has a small lake just across the property line, and he depends on this lake to water his cattle. By late summer, Farmer Smith goes out to his lake and discovers it is dry. What happened?

A) There must have been a drought or Farmer Brown wouldn't have needed to irrigate, so it must be natural.
B) Farmer Brown's well produced a sinkhole that swallowed up Farmer Smith's lake.
C) Farmer Browns well has dropped the water table in the well's cone of depression, and the well has led to the lake drying up.
D) Farmer Brown has been secretly pumping water from Farmer Smith's lake, and now Farmer Smith is going to come out at night with a shotgun.