Subject: mathqa
Question: mariah has decided to hire three workers . to determine whom she will hire , she has selected a group of 15 candidates . she plans to have one working interview with 3 of the 15 candidates every day to see how well they work together . how many days will it take her to have working interviews with all the different combinations of job candidates ?
Option: 
A: 360
B: 300
C: 120
D: 720
Answer: A