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:
Marta studied different forms of energy. Which two types of energy travel in waves?  
 (A) light and sound (B) electrical and sound (C) chemical and light (D) chemical and electrical
answer:
A


question:
A hardware designer finds that the wiring in a circuit is releasing enough heat to make the circuit dangerously hot. Which change would best solve this problem?  
 (A) increasing the current in the circuit (B) placing rubber insulation on wires in the circuit (C) reversing the direction of current flow in the circuit (D) using circuit wires with a lower resistance
answer:
D


question:
Which process will directly result in organic matter being added to the soil?  
 (A) water freezing in cracks of rocks (B) glaciers carving out a valley (C) river water eroding the banks of a stream (D) bacteria breaking down dead matter
answer:

D