You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

[Q]: A student hypothesizes that algae are producers. Which question will best help the student determine if this is correct?
(A) Do algae consume other organisms? (B) Which organisms consume algae? (C) Do algae use sunlight to make food? (D) Could an ecosystem survive without algae?
[A]: C

[Q]: A biological community is made up of all the
(A) populations living in an area (B) natural resources present in an area (C) members of a species on Earth (D) environments on Earth
[A]: A

[Q]: Which of these human activities in a forest has a positive 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 farmland
[A]:
B