Why did former President Barack Obama give Avant-garde a shout-out?

Because he wanted to recognize her hard work as a student and athlete
Because he wanted to learn how to juggle four basketballs at a time
Because he wanted to award her with a $50,000 cash prize
Because he wanted to offer her a job in space exploration at NASA

There is no specific information available regarding former President Barack Obama giving a shout-out to Avant-garde. The options you provided are purely speculative and not based on any known fact or event.