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.

Ex Input:
What is a common use of the mineral graphite?  
 (A) to make glass (B) as a source of iron (C) to make pencil leads (D) as a household cleaner

Ex Output:
C


Ex Input:
For a technology project, Kyle came up with an idea to build a model bridge. He wants his bridge to span 50 cm and to support a 1 kg object. According to the engineering design process, which of the following should be Kyle's next step?  
 (A) construct prototypes of different kinds of bridges (B) research the different designs of bridges (C) gather the materials needed to build the bridge (D) make a drawing to show how to build the bridge

Ex Output:
B


Ex Input:
In a turtle race, each turtle walks one a 3-meter track. If the turtles walk one at a time, how can you tell which turtle was fastest?  
 (A) The turtle that started first is fastest. (B) The turtle that finished first is fastest. (C) The turtle that took the shortest time is fastest. (D) The turtle that took the longest time is fastest.

Ex Output:

C