You are given a science question (easy-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: A boy pulls a sweater off over his head. His hair is attracted to the sweater due to  
 (A) a magnetic force (B) a heat transfer (C) a chemical change (D) an electrical charge

A: D
****
Q: An object such as a hammer weighs less on the Moon than on Earth. This is because the Moon has a  
 (A) thinner atmosphere than Earth. (B) smaller diameter than Earth. (C) stronger magnetic field than Earth. (D) lower mass than Earth.

A: D
****
Q: Which of these events is an example of a change in climate?  
 (A) Afternoon clouds form and block the sunlight. (B) A series of tornadoes occurs over a one-week period. (C) An overnight temperature drop causes frost to form. (D) The average amount of annual precipitation decreases.

A:
D
****