TASK DEFINITION: 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.
PROBLEM: Parents with freckles often have children with freckles. This occurs because  
 (A) freckles develop from light. (B) certain foods cause freckles. (C) certain habits cause freckles. (D) freckles are an inherited trait.

SOLUTION: D

PROBLEM: A scientist is searching for areas where new solar systems might form. What feature is the scientist looking for?  
 (A) a star similar to our Sun (B) a cloud of dust and gas (C) an oxygen-rich atmosphere (D) a gravitational acceleration of 9.8 m/sec2

SOLUTION: B

PROBLEM: In which layer of the atmosphere does most of Earth's weather occur?  
 (A) the exosphere, which is the outermost layer (B) the troposphere, which is the lowest layer (C) the thermosphere, which has the highest temperature (D) the stratosphere, which contains a sub-layer of ozone

SOLUTION:
B