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 of these human activities in a forest has a *** effect on the ecosystem?  (A) Clearing the land to build new homes (B) Planting new trees where old ones were cut down (C) Building a new highway through the area (D) Cutting down trees to make farmlan.
E.

Question: Tobias rode his *** on a *** for a *** *** ***. On average, he passed a 1 *** marker every 3 *** during this ***. Which of the following was his *** *** for this *** *** ***?  (A) 10 km/hr (B) 15 km/hr (C) 20 km/hr (D) 25 km/h.

E.