An activist club is advocating against the opening of Walmart in a city and has decided to go to the Mayor's office every day. The secretary of the club has proposed taking exactly 4 people with him every day. If the secretary goes with a different group of people every day, including weekends and holidays, how many days can he go without repeating a group?
1. The club has 10 members.
2. Every day, the secretary does not take exactly 5 members of the club with him.
Answer: D
Source: e-GMAT