You are presented with the quiz "What can cause famine?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "drought is when amount of precipitation decreases" and "drought causes famine, which contributes to decentralization and unrest". So, what's the best answer to the question?
Choices: [I] Movement of an air mass; [II] Effective fertilizers; [III] the ground shaking; [IV] Increased irrigation; [V] Crop harvesting; [VI] Decreased precipitation; [VII] single-celled organisms; [VIII] forest is destroyed;
[VI]