Architecture is crucial for community art as it allows a massive audience to experience artworks and showcases how artists interact with their environment. However, describing artworks made by people with shared interests is too broad for this context. Option a and b is the correct choice.
Correctly describing why architecture is an important medium for community art are:
a. Considering possible ways a massive number of viewers are able to experience artworks: Architecture, as a permanent and often public medium, allows a large audience to experience and interact with artworks integrated into the built environment, fostering community engagement.
b. Showing ways artists have interacted with their environment: Architecture serves as a canvas for artists to respond to and interact with the surrounding environment, contributing to a dialogue between artistic expression and the community's context.
Incorrect:
c. Artworks that are made by people with shared interests: This description doesn't specifically relate to the unique role of architecture in community art. It is a broader characteristic that applies to various art forms, not specifically tied to the built environment. So, Option a and b is the correct choice.