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.
--------
Question: What is a main feature of plains?  
 (A) a flat, level surface (B) a high, steep peak (C) a low, shallow basin (D) a gentle, gradual slope

Answer: A


Question: Which of the following was invented by Benjamin Franklin?  
 (A) bifocal lens (B) telescope lens (C) telephone (D) camera

Answer: A


Question: There are a variety of events that can disrupt ecosystems. Some events result in local disturbances and others can affect a much larger area. Which event would most likely result in change on a global scale?  
 (A) land scarred by forest fires (B) erosion of ocean shorelines (C) converging plate boundaries (D) destruction of tropical rain forests

Answer:
D