Twentieth-century artist, and creator of fountain (a factory-made urinal), was very influential for later artists working in alternative media.

a. marcel duchamp
b. jackson pollock
c. john cage
d. claes oldeburg

A. Marcel Duchamp.

Explanation:

Marcel Duchamp made a porcelain sculpture of an urinal labeled "Fountain" in 1917. Later on, more prototypes were made to be n display in various art sites, leading to the popularity of this piece.

His work began to be thus seen as a major influential factor for the upcoming artists from various alternative medias. These alternative medias include installations, performance arts, conceptual arts and even environments. The eventual increase in these fields led to the popularity of the original maker of the "Fountain".