instruction:
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.
question:
A student is mixing a cup of hot chocolate with a spoon. How is the heat transferred between the hot chocolate and the part of the spoon that is in the hot chocolate?  
 (A) Conduction transfers energy from the spoon to the hot chocolate. (B) Conduction transfers energy from the hot chocolate to the spoon. (C) Convection transfers energy from the spoon to the hot chocolate. (D) Convection transfers energy from the hot chocolate to the spoon.
answer:
B


question:
Which is the best piece of equipment to determine the topography of the United States?  
 (A) radar (B) compass (C) satellite (D) radio
answer:
C


question:
Why do most of the leaves of forest trees grow at the top of the tree?  
 (A) to scatter seeds (B) to capture sunlight (C) to shade the trunk (D) to collect water
answer:

B