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: How does a parachute sufficiently increase air resistance to allow the parachutist to land safely?   
 (A) by decreasing the force of gravity acting on the parachutist (B) by decreasing the total mass of the parachutist (C) by increasing the surrounding air pressure around the parachute (D) by increasing the total surface area of the parachute

A: D
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Q: What best explains why some cooking pans have rubber handles?  
 (A) The rubber in the handles is easy to hold. (B) The rubber in the handles is a good insulator. (C) The rubber in the handles keeps the food in the pan hot. (D) The rubber in the handles keeps the metal in the pan cool.

A: B
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Q: Which process in the carbon cycle takes the longest to complete?  
 (A) emission of waste (B) respiration in animals (C) photosynthesis in plants (D) formation of fossil fuels

A:
D
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