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.

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

Example Input: Question: Plants on hills keep dirt in place during a rain storm. Plant roots grow into the dirt and keep the dirt from moving. Why do roots grow into the dirt? (A) to release gases (B) to release water (C) to absorb energy (D) to absorb nutrients?
Example Output: roots, grow, dirt?

Example Input: Question: Runoff from farm land, construction sites, irrigation drainage systems, and lawn chemicals can most directly contribute to polluting our ___. (A) drinking water (B) weather patterns (C) Earth's molten core (D) breathable air?
Example Output:
Runoff, contribute, polluting