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.

[Q]: One important use of coal is to produce energy for homes. Coal can be burned and converted to  
 (A) wind energy. (B) nuclear energy. (C) electrical energy. (D) solar energy.
[A]: C


[Q]: Joann repeatedly overfed the fish in the pond behind her house. The nitrates from the excess food contributed to an overgrowth of algae. To correct the problem, Joann added more plants to the pond. How will adding more plants help?  
 (A) The plants make the pond look beautiful. (B) The plants will camouflage the green algae. (C) The plants will compete with algae for nutrients. (D) The plants will provide all the food for the fish.
[A]: C


[Q]: People sitting around a campfire are able to feel the heat from the fire. How are the people able to feel the heat from the fire without touching the fire?  
 (A) The heat from the fire travels through the ground and heats the ground around the people. (B) The heat from the fire is conducted through air molecules to the people. (C) The heat from the fire rises in the air and then settles around the people. (D) The heat from the fire radiates from the fire to the people.
[A]:
D