Acording to Part 3 listening， what do Google do to motivate staff？

Acording to Part 3 listening， what do Google do to motivate staff？
A.A free bus ride to work for the employees.
B.A dentist and a hairdresser at the office.
C.A cheap massage in the office.
D.A party for the staff every month.
正确答案：A cheap massage in the office.