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.

Ex Input:
Which material is most easily recycled at school?  
 (A) plastic wrap (B) notebook paper (C) ice cream sticks (D) rubber erasers

Ex Output:
B


Ex Input:
Which is the most important safety measure to follow when using an acid in a classroom laboratory?  
 (A) wearing protective clothing and goggles (B) keeping the window open (C) closing the door to the hall (D) using bright fluorescent lights

Ex Output:
A


Ex Input:
When compared to current average conditions, which term would best describe conditions in Earth's lower atmosphere if greenhouse gases were absent?  
 (A) denser (B) cooler (C) wetter (D) cloudier

Ex Output:

B