Which sentence is punctuated correctly?

The contents of the box consisted of seven, long-haired kittens.

Marilyn was a lively outgoing, girl.

Most of the middle schoolers hang out at the old, cool ice cream shop on 23rd Street.

Is it A or C?

http://grammar.ccc.commnet.edu/grammar/commas.htm

Scroll down and read #5 carefully. Then let us know whether you think A or C is correct.