Given the task definition and input, reply with output. 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).

Paragraph: The pupil automatically gets bigger or smaller to let more or less light in as needed.
 Question: Will's pupils grew smaller as the day grew brighter. This happens to let _____ light in. 
 Choices: A)less 
B)more
less