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.

Which is a compound?  
 (A) Nitrogen (N_{2}) (B) Neon (Ne) (C) Ozone (O_{3}) (D) Ammonia (NH_{3})
D

A car tire runs over a can and crushes it completely. Which statement is true for the atoms of the structure of the can?  
 (A) The atoms are broken. (B) The atoms are flattened. (C) The atoms remain the same. (D) The atoms are changed into different atoms.
C

Which of these elements is not likely to be found in an organic compound?  
 (A) carbon (B) hydrogen (C) nitrogen (D) potassium

D

