In this task, you need to answer basic science questions. For each question, several terms are intentionally masked with ***. This masking can cover very few or many of the question words. Clearly, if masked terms are important, the modified question will be impossible to answer. Please indicate the correct answer with one of the following responses: "A", "B", "C", "D" or "E". While "A"-"D" correspond to the answer options provided in the input, "E" represents "I don't know" for questions that do not provide enough information. Respond via "E" if the question is not answerable. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D', 'E'.

Question: The functions of a plant's roots are to support the plant and  (A) make food (B) produce fruit (C) take in water and nutrients (D) aid in germination.
C.

Question: Which object is the best conductor of electricity?  (A) metal fork (B) rubber boot (C) plastic spoon (D) wooden bat.
A.

Question: James and Jordan roll their cars across the carpeted living room floor. They notice that they are not moving as fast as they had when they played on the tiled kitchen floor. Which force is responsible for slowing down the cars?  (A) Wind (B) Gravity (C) Thrust (D) Frictio.

D.