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: Which of the following tools is most useful for tightening a small mechanical fastener? (A) chisel (B) pliers (C) sander (D) saw?
[A]: tools, tightening, mechanical, fastener?


[Q]: Question: A car has a small gasoline engine combined with a battery-powered electric motor. When the car stops at a red light, the gasoline engine stops running and the electric motor begins working. How does this type of car most likely benefit people? (A) reduces traffic (B) uses less gasoline (C) accelerates faster (D) carries more passengers?
[A]: small, gasoline, engine, combined, battery-powered, electric, motor., type, car, benefit, people?


[Q]: Question: Why are scientists able to accurately predict when it will be a Full Moon? (A) The time it takes for the Moon to rotate around the Earth never changes, and this, along with the Sun, determines the phases of the Moon. (B) The time it takes for the Earth to rotate around the Sun never changes, and this, along with the Sun, determines the phases of the Moon. (C) The time it takes for the Earth to rotate around the Moon never changes, and this, along with the Sun, determines the phases of the Moon. (D) The time it takes for the Moon to rotate on its axis never changes, and this, along with the Sun, determines the phases of the Moon.?
[A]:
accurately, predict, Full, Moon?