Thirteen Sorority Sisters Decide to Start a Dog-Walking Business

Thirteen sorority sisters decide to start a dog-walking business. They incorporate under the name Pro Canine Walkers Inc., and advertise their services throughout the city in newspapers and on flyers they post. All stock is owned by the 13 principals, and none is offered to anyone outside the 13. This corporation would be classified as a:

A) privately held corporation.
B) privately held public corporation.
C) privately held professional corporation.
D) privately held public professional corporation.