Instructions: 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).
Input: Paragraph: This means that as wavelengths get shorter, more waves move past a particular spot in the same amount of time.
 Question: As the train approached the intersection and blew its horn, expanding the wavelengths of the sound, did the frequency of the horn 
 Choices: A)increase 
B)decrease?
Output:
decrease?