In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

2000 years ago, this method would likely have brought sand from the coast to the desert (A) the pyramids often eroded, making their own sand (B) constant breezes over time (C) human automobiles transfer materials (D) the space shuttle moved sand great distances
B

animals learn some behaviors from watching their (A) rocks (B) toys (C) caretakers (D) trees
C

The deforestation can be the cause of what occurrence? (A) death of trees (B) death of oceans (C) saline solutions (D) global warming

A