The Seven Years' Famine Occurred Because

The Seven Years' Famine occurred because:

A) Europe had reached the limit of its ability to supply food for its population and the climate warmed by approximate two degrees centigrade.
B) Europe's climate cooled by ten degrees centigrade.
C) Europe had reached the limit of its ability to supply food for its population and the climate cooled by approximately two degrees centigrade.
D) Europe had reached the limit of its ability to supply food for its population and a drought occurred.
E) Europe's climate warmed by ten degrees centigrade.