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]: A drug company developed a pill to reduce cases of stomach virus. To test the medication, half of the participants got the pill with the new medicine and half got a sugar pill. Which term best identifies the participants who got a sugar pill?  
 (A) control (B) experimental (C) dependent variable (D) independent variable
[A]: A


[Q]: Which of these best describes wind energy?  
 (A) limited (B) renewable (C) damaging (D) inexpensive
[A]: B


[Q]: The fossils that are found in the oldest layers of sedimentary rock were formed which types of organisms?  
 (A) only organisms that lived in the sea (B) only organisms that lived on land (C) only organisms that lived in the air (D) organisms that lived on the land, in the sea and in the air
[A]:
A