Select the letter of the word in the sentence that is a look-alike/sound-alike error. First Tony scraped the floors; then he set in a corner and surveyed his fine work.

A) then
B) set
C) fine

Set

A collection of distinct objects, considered as an object in its own right in mathematics, or the scenery for a film or theater production.

Then

Used to indicate what happened or happens next in a sequence of events.