The best support for the idea that Blake's after-school job was going to be the "best after-school job in the history of after-school jobs" is:
A. Two days a week he would check in kids, direct them to their activities, and then sit back and talk to Josh while little kids played indoor soccer.
This sentence highlights the enjoyable aspects of Blake's job, suggesting that he would have fun while working with the kids and spending time with a friend.