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:
A student wants to organize a group of animals into two categories based on observable external features. Which display will most appropriately show the two categories of animals?
(A) a timeline (B) a pie chart (C) a data table (D) a line graph
answer:
C

question:
What is an environmental threat posed by oil and gas acquisition and transport that is not posed by the acquisition and transport of the energy resources uranium, and wood?
(A) habitat change (B) vehicle pollution (C) pipeline leaks (D) soil compaction and loss
answer:
C

question:
Why are some rocks smoother and rounder than others?
(A) They have the shapes of the minerals from which they are made. (B) They were smoothed by the action of wind and water. (C) They were squeezed up through the soil. (D) They hardened in rounded pockets of soil.
answer:
B