Which of the following is a condition placed on receiving the discount?
原文依据：An advanced reservation… at least 10 working days before your stay, is required to qualify for the discount.
享受折扣的条件是至少提前 10 个工作日预订，也就是必须提前预订。
A：可用任何信用卡 → 错误，必须用美国运通公司卡
B：必须在入住前提前预订 → 正确
C：必须电话和网站都预订 → 错误，只说打电话
D：必须现金支付 → 错误