TASK DEFINITION: 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.
PROBLEM: Which of the following would be more likely to pollute a river?
(A) allowing beavers to build a dam (B) spreading fertilizer near the river (C) mowing the grass on the river bank (D) fishing from a bridge over the river

SOLUTION: B

PROBLEM: The first telescopes were invented hundreds of years ago. Which was discovered as a result of this invention?
(A) the moons of Jupiter (B) the bacteria that causes disease (C) the deep-sea trenches in the ocean (D) the parts of a plant that perform photosynthesis

SOLUTION: A

PROBLEM: Which is made by plants to attract pollinators to flowers?
(A) sap (B) oxygen (C) nectar (D) carbon dioxide

SOLUTION:
C