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.

Q: A meeting of scientists, called a symposium, occurs every year to share recent research about the atmosphere of Earth. This symposium mainly serves which purpose in science?  
 (A) to test research methods used by other scientists (B) to develop questions about space research (C) to discuss the meaning of new discoveries (D) to explain gas properties to the general public

A: C
****
Q: How is xylem similar to phloem in a plant?  
 (A) They both take in water from the soil. (B) They both transport materials through the plant. (C) They both make sugar in the leaves. (D) They both store waste products in the plant cells.

A: B
****
Q: In order to make a line graph showing the rate of erosion on the banks of a river during a week-long flood, the y-axis should be labeled as the width of the river bank, in meters. The best label for the x-axis is time, in  
 (A) seconds. (B) minutes. (C) hours. (D) days.

A:
D
****