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).
Q: Paragraph: When the heart expels more blood with each stroke, the heart has to beat less often in order to maintain the same volume of blood flow.
 Question: Don notices that the patient's heart is expelling more blood with each stroke. The patient's heart has to beat _____ often to maintain consistent blood flow. 
 Choices: A)more 
B)less
A:
less