You are given an elementary science question along with a few answer options. List all the words from the question that are essential and sufficient for choosing the correct answer option. Keep in mind that essential words are necessary to understand the meaning of the given question. However, non-essential words provide little information needed to select the correct answer. You can think about it like this: If the question was in another language, knowing the meaning of which words were necessary and enough for you to understand the question and answer it?. If your answer consists of multiple spans of words from the question, separate those using a comma (", "). Do not generate any word that is not present in the question. Make sure that your response is contained in the given question and the words are in the same order as the question.
 Grammatical correctness is not important.

[Q]: Question: A student riding a bicycle observes that it moves faster on a smooth road than on a rough road. This happens because the smooth road has (A) less gravity(B) more gravity(C) less friction(D) more friction?
[A]: faster, smooth, rough, smooth


[Q]: Question: A scientist needs to take a picture of the well-ordered arrangements of the atoms and molecules within a substance. Which of the following instruments would be best for the scientist to use? (A) a laser light with holograph. (B) a seismograph. (C) an electron microscope. (D) a stereoscope.?
[A]: picture, arrangements, atoms, molecules, instruments


[Q]: Question: When Isaac Newton theorized that gravity caused objects to fall to the ground, he had also discovered the force that causes (A) chemicals to react. (B) volcanoes to erupt. (C) lightning to strike Earth. (D) the planets to orbit the Sun.?
[A]:
Isaac, Newton, gravity, discovered, force, causes