Which of the following sentences use commas correctly? Check all that apply.

Maurice listened to the team’s proposal and then he promptly turned it down.
Please submit your proposal before October 15, 2008.
All participants must sign in register their vehicles and report to their assigned locations before 7:30.
Not one employee was willing to sit at the desk, that had belonged to the man who turned out to be a serial killer.
When she returned to work after maternity leave, she learned that her office had been relocated to the second floor.

In the real world, feldman learned to settle for less than 95 percent. he came to consider a company “honest” if its payment rate was above 90 percent. he considered a rate between 80 and 90 percent “annoying but tolerable.” if a company habitually paid below 80 percent, feldman might post a hectoring note, like this one: the cost of bagels has gone up dramatically since the beginning of the year. unfortunately, the number of bagels that disappear without being paid for has also gone up. don’t let that continue. i don’t imagine that you would teach your children to cheat, so why do it yourselves? the excerpt serves as which type of support for the authors’ argument? a claim an example a conclusion a counterclaim