question: How will the color of litmus paper change if rain downwind of a coal-fired plant falls on it
choices.text: upper epidermis be used incorrectly dead trees VOCs and NOx detrimental hydrogen and oxygen lung irritants From blue to red
choices.label: A B C D E F G H
formatted_question: How will the color of litmus paper change if rain downwind of a coal-fired plant falls on it (A) upper epidermis (B) be used incorrectly (C) dead trees (D) VOCs and NOx (E) detrimental (F) hydrogen and oxygen (G) lung irritants (H) From blue to red