Habitat for Humanity Renovates Vacant Houses and Sells Them at No-Interest

Habitat for Humanity renovates vacant houses and sells them at no-interest mortgage rates to low-income homebuyers. The organization relies on volunteers to provide the labour and funding for its renovations. How would Habitat for Humanity be classified?

A) as an image-oriented organization
B) as a for-profit organization
C) as a nonprofit organization
D) as a service organization