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: Some scientists believe that the mass extinction of dinosaurs was caused by the impact of a large meteorite on Earth. This impact would have caused a darkening of the sky due to dust blown into the upper atmosphere. This darkening would have reduced the sizes of some ecosystems because of  
 (A) longer seasons. (B) accelerated erosion. (C) reduced photosynthesis. (D) increased number of hurricanes.

SOLUTION: C

PROBLEM: A student counts ants in an ant colony every day at the same time. The student writes the date of observation in one column in a notebook and the number of ants counted on each date in a second column. Which best describes how the student arranged the information?  
 (A) pie chart (B) data table (C) bar graph (D) scatterplot

SOLUTION: B

PROBLEM: Which best describes the structure of an atom?  
 (A) a lightweight core surrounded by neutral particles (B) a massive core surrounded by negatively-charged particles (C) a network of interacting positive and negative particles (D) overlapping layers of neutral, positive, and negative particles

SOLUTION:
B