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: As you increase the number of carbon atoms in a hydrocarbon, the number of isomers quickly increases.
 Question: Dean wants to get a smaller number of isomers to observe, so in order to do so quickly, he takes the number of carbon atoms in a hydrocarbon, and makes them 
 Choices: A)decrease 
B)increase
decrease