Which of the Following Four Firms Would Most Likely Be

Which of the following four firms would most likely be part of a monopolistically competitive market?

A) Lee, J Brand, Joe's Jeans, Paper Denim & Cloth, Levi's, and Wrangler are all producers of jeans.
B) Mark sells the tomatoes he grew in his backyard at the local farmers market.
C) The WaveHouse is the only place in San Diego where you can ride an indoor 10 foot wave.
D) Amara Massage is the only firm which specializes in pre- and post-natal massage.