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.

Which of these warms most of the air, water, and land on Earth?  
 (A) Coal (B) Electricity (C) Sunlight (D) Wind
C

A shallow container of salt water is placed in sunlight for a day. Which is the most likely result?  
 (A) All of the mixture will evaporate. (B) The salt will keep the water from evaporating. (C) The salt will separate from the water and float at the top of the container. (D) Only the water will evaporate and the salt will remain in the container.
D

Which of the following statements best describes sandy soils?  
 (A) Sandy soils allow water to drain quickly. (B) Sandy soils easily break down into clay sediments. (C) Sandy soils hold plant roots tightly in place to prevent erosion. (D) Sandy soils have high levels of decomposed plant and animal matter.

A