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.

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
D

Which function makes a plant cell different from an animal cell?  
 (A) ability to use energy (B) ability to absorb nutrients (C) ability to divide into two cells (D) ability to convert sunlight into energy
D

Which statement best explains why summer days are warmer than winter days in Arkansas?  
 (A) The Sun is closer to Earth in the summer than in the winter. (B) The Sun has more sunspots in the summer than in the winter. (C) Earth's western hemisphere is tilted toward the Sun during the summer. (D) Earth's northern hemisphere is tilted toward the Sun during the summer.

D