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").

A skill some humans have is (A) ten fingers (B) vision (C) heart beating (D) talking
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

Mechanical weathering is a end result of a (A) wind turbines (B) solar panel (C) shad tree mechanic (D) giant ice river

D