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.

[Q]: Many states require vehicles to be examined and to meet safety and pollution standards. What impact might vehicle inspections have on the environment?  
 (A) The environment will not be polluted. (B) The environment will become more polluted. (C) Fewer pollutants will be released by vehicles. (D) Fewer pollutants will be produced by older vehicles.
[A]: C


[Q]: A negative effect of the invention and use of paper is the  
 (A) increased use of glass bottles. (B) increased number of trees cut down. (C) decreased pollution in trash dumps. (D) decreased amount of books to read.
[A]: B


[Q]: Millions of people living all over the world have cancer. Is cancer a pandemic?  
 (A) No, because cancer is not contagious. (B) No, because cancer is not always fatal. (C) Yes, because millions of people have cancer. (D) Yes, because people all over the world have cancer.
[A]:
A