Use reasoning to lead to the answer of the following question:
An attempt to confirm an applicant's reference would fail if the reference does what?\nOptions:\n- question\n- dispute\n- deny\n- contradict\n- refuse
 Reasoning process:
User
If a confrmation is denied, the confirmation fails. When a refrence deny the confirmation, it means they do not know that person which fails the confirmation. Therefore, the final answer is deny.
Assistant