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: Acids have pH values below 7. The lower the pH value, the more strongly acidic the substance.
 Question: A pH value of 9 has a _____ acidity level than a pH value of 8. 
 Choices: A)lower 
B)higher
lower