You are given a science question (hard-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:
A student plans to design a new toothpaste tube that will give the same amount of toothpaste every time it is squeezed. Which should the student do first when designing the new tube?  
 (A) make a data table of amounts of toothpaste (B) gather building materials (C) create models of old toothpaste tubes (D) draw a few possible solutions

Ex Output:
D


Ex Input:
Which of the following activities should be omitted from scientific inquiry?  
 (A) changing data to fit expected results (B) designing and carrying out investigations (C) formulating detailed hypotheses (D) communicating results to others

Ex Output:
A


Ex Input:
Students conducted a scientific investigation about soil types found in the school yard. What should the students most likely do to be sure their investigation will be understood by the class next year?  
 (A) Include the names of the students that worked on the investigation. (B) Correctly label all the data in their charts and tables. (C) Take a picture of the students doing the study. (D) Give the report to the teacher.

Ex Output:

B