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]: 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
[A]: A


[Q]: Which land feature is formed from erosion by waves?   
 (A) a sandbar (B) a sea cliff (C) a barrier reef (D) a barrier island
[A]: B


[Q]: In some national parks, controlled fires are maintained by firefighters. Which of these is one of the major reasons for using controlled burns to maintain certain ecosystems?  
 (A) to give nonnative plants a chance to colonize the region (B) to prevent the spread of pests that cause damage to plants (C) to replace matured plants with saplings of the same species (D) to rid the forest floor of accumulated deadwood and brush
[A]:
D