Pigment providing colour to stool is -
The characteristic brown colour of feces is due to the presence of pigment stercobilin (derived from stercobilinogen).

So, actually it is stercobilin (not stercobilinogen) which is responsible for the brown color of feces. Stercobilin is derived from stercobilinogen and therefore stercobilinogen is the best answer amongst the options provided.
Stercobilinogen
Urobillinogen
Mevobilirubin
Bilirubin