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.

Which of these meals would give you most of the nutrients that you need?  
 (A) Meat, milk, and a piece of chocolate (B) Bread, vegetables, and fish (C) Vegetables, fruits, and water (D) Meat, fish, and bread
B

Which of these do all cells release?  
 (A) sugar (B) water (C) energy (D) oxygen
C

Two bicyclists were riding their bikes at a rate of 20 kilometers per hour (km/h). During the next half hour, they observed that they had increased their speed to 26 km/h. What was their average acceleration?  
 (A) 0.2 km/h^2 (B) 3.0 km/h^2 (C) 6.0 km/h^2 (D) 12.0 km/h^2

D