You are given a science question (easy-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.

A pot is heated on a stove. Which process causes the metal handle of the pot to also become hot?  
 (A) combustion (B) convection (C) radiation (D) conduction
D

Which of these is the center of our solar system?  
 (A) Mars (B) The moon (C) Jupiter (D) The sun
D

The movement of soil by wind or water is called  
 (A) condensation (B) evaporation (C) erosion (D) friction

C