You are given a science question (hard-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

[Q]: Greta passed a comb through her hair several times. She then placed the comb next to a stream of water flowing from a faucet. Greta observed the stream of water bend toward the comb. How did passing a comb through her hair allow the comb to bend the stream of water?  
 (A) by making the comb more absorbent (B) by giving the comb an electrical charge (C) by increasing the thermal energy of the comb (D) by breaking some of the chemical bonds in the comb
[A]: B


[Q]: Several horses grazed in a fenced area across from a home. On rainy days, soil would wash down a slope and run toward the home. After the horses were moved a few years later, the soil no longer washed down when it rained. What could account for this change?  
 (A) The grass grew and kept the soil intact. (B) The fence kept the soil contained. (C) The soil was completely gone. (D) The amount of rain decreased.
[A]: A


[Q]: Which of these most likely has the GREATEST mass?  
 (A) Chicken (B) Puppy (C) Lizard (D) Horse
[A]:
D