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: Students are designing kites to discover what type of kite flies the highest. Which is the most important to consider when designing a kite to fly high?
(A) string length (B) surface area (C) materials used (D) time of day

SOLUTION: B

PROBLEM: Emily made a cup of tea and stirred it with a spoon. The spoon became warm. How was the heat from the tea transferred to the spoon?
(A) convection (B) radiation (C) conduction (D) evaporation

SOLUTION: C

PROBLEM: People may remove fallen trees from forests to reduce fire risk. Removing the trees is now thought to have an impact on the health of the forest. Which impact would removing fallen trees from forests most likely have on forest health?
(A) increased risk of forest fire (B) increased food sources for forest fungi (C) decreased soil fertility by preventing nutrient recycling (D) decreased forest vegetation by increasing sunlight penetration

SOLUTION:
C