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.

Question: Mr. Burk's students test the ability of aluminum, plastic, and sand to conduct electricity. Which could be a reasonable entry in their scientific journals after testing the three materials? (A) Only aluminum conducts electricity. (B) Aluminum, plastic, and sand are good conductors. (C) Only plastic and sand conduct electricity. (D) Only sand conducts electricity.?
ability, sand, conduct, electricity., reasonable, entry, scientific, journals

Question: Humans have bacteria inside as well as outside the body. These bacteria are __________. (A) both beneficial and harmful (B) harmful and spread disease (C) harmful all of the time (D) helpful all of the time?
Humans, bacteria, inside, outside, body.

Question: Which model is used by scientists to determine the properties of elements? (1) a Punnett square (2) the Periodic Table (3) a pedigree chart (4) the rock cycle?

model, determine, properties, elements?