All of the following people are U$.$S$.$ citizens and cannot claim a dependent themselves. Based on the information provided, which of them could potentially be a qualifying child?

Brooke is $19.$ She is a full$-$time student at the University of Arizona. Her parents live in Colorado.

Marco is $26$ and lives with his mother. Marco is not disabled.

Rand is $18,$ and lived with his father for three months before moving into his own apartment. Rand is not a student.

Torii is $15.$ She lives with her parents. She earned $$75,000$ from her YouTube channel this year.