Answer: A. Stephano's interest in Caliban is purely selfish.
Stephano is the butler of King Alonso in the play The Tempest by William Shakespeare. Stephano, along with Trinculo and Caliban, plotted against Prospero, the former Duke of Milan and ruler of the island. Stephano wants to take over the island and marry Miranda, Prospero's daughter. In these lines, we can see that Stephano's interest in Caliban is purely selfish, and that he has no interest in his well-being.