Given the task definition, example input & output, solve the new input case.
You are given a short paragraph, a question and two choices to answer from. Choose the correct answer based on the paragraph and write the answer(not the key).
Example: Paragraph: Many of the worlds people live with water scarcity, and that percentage will increase as populations increase and climate changes.
 Question: John's town used to have lots of water, back when there were only a few hundred people. However, now that the town holds several thousand people, the water availability is 
 Choices: A)scarce 
B)plentiful
Output: scarce
Based on the information given in the paragraph, population growth will make water more scarce, so that is the correct answer.

New input case for you: Paragraph: The more curved the surface of a lens is, the more it refracts the light that passes through it.
 Question: In a science class, the professor demonstrates refraction to the class. First, the professor shows a curved lens from a binocular, and then a flat pane of glass, demonstrating that 
 Choices: A)the curved lens refracts more light 
B)the flat pane refracts more light.
Output:
the curved lens refracts more light