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.

[EX Q]: A delta can be seen from the air at the mouth of the Mississippi River. This delta was formed by  
 (A) erosion. (B) weathering. (C) conservation of soil. (D) deposition of sediment.
[EX A]: D

[EX Q]: A car runs out of fuel while traveling on a level road and eventually comes to a stop. Which of the following best explains why the car stops?  
 (A) Some of the energy of the car was lost to friction. (B) Some of the energy of the car was destroyed. (C) The amount of kinetic energy increased. (D) The amount of useful energy increased.
[EX A]: A

[EX Q]: Which of the following is an example of matter changing state?  
 (A) heating a pan of water until the water is all gone (B) putting a soft-drink can in the refrigerator to cool it (C) heating soup on the stove until it is hot to your tongue (D) transferring sugar into a storage container
[EX A]:
A