You will be given a definition of a task first, then some input of the task.
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: A hydrocarbon that halves its carbon atoms will cause an _____ in the amount of isomers. 
 Choices: A)decrease 
B)increase
Output:
decrease