TASK DEFINITION: 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.
PROBLEM: 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.

SOLUTION: B

PROBLEM: Which of these is not a benefit of microorganisms?
(A) They release nutrients in soil. (B) They help make antibiotics. (C) They cause food to spoil. (D) They break down waste.

SOLUTION: C

PROBLEM: Two students each carry a box up to the third floor of a building. The total mass of each student and the box she is carrying is the same. Roberta makes the trip in 45 s while Mary takes 30 s. Which of the following statements best describes this task?
(A) Roberta does more total work than Mary. (B) Mary does more total work than Roberta. (C) Roberta has a greater power output than Mary. (D) Mary has a greater power output than Roberta.

SOLUTION:
D