The right option is:
Sancho and Bolsa.
In scene 13, Sancho and Bolsa enter a restaurant called The Purple Cow, which William usually visits and from where they hope to obtain clues as to his whereabouts.
When the waitress named Carlotta asks for their order, Sancho tells Bolsa to let him talk, since he was the one who discovered the clue, Bolsa annoys him by saying that just for getting a little clue he now believes he is "the big dog."
Although Sancho does not like the nickname at first, after obtaining good results he himself affirms that he may be "the big dog," Therefore, that is the correct option.
More information:
https://brainly.com/question/17666641?referrer=searchResults
