instruction:
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.
question:
Rock layers with sand-sized particles were most likely deposited by  
 (A) wind. (B) water. (C) glaciers. (D) landslides.
answer:
A


question:
Which is a way the agricultural biotechnology industry could have a positive impact on the environment?  
 (A) by producing crops that are virus resistant (B) by making robots to replace large farm machines (C) by reducing the need for countries to import food (D) by increasing the use of wind farms that produce electricity
answer:
C


question:
Frogs and salamanders compete with each other for insects. Both frogs and salamanders catch flying insects with their tongues. Which feature would most likely help both animals compete for flying insects?  
 (A) sticky tongues (B) bright tongues (C) thick tongues (D) short tongues
answer:

A