[CFA Level 1] 请教1道一级TVM题 return, annual, receive, payment, investor

arabdopsis1

 An investor wants to receive $10,000 annually for ten years with the first payment five years from today. If the investor can earn a 14% annual return, the amount that she will have to invest today is closest to:
A $27091
B $30884

答案是B

ms问题的关键是52161$ （总的payment）按照5年折现还是按4年折现； 答案是按4年折现， 这是怎么回事呢？ 多谢多谢！