an assumed identity
The answer choices have two options which could qualify as the mask's denotative meaning. A word's denotative meaning is its literal meaning. The literal meaning of mask could be considered a covering for the face, or an article of clothing. These options are wrong since you need the connotative meaning.
The connotative meaning of the word is its inferred secondary meaning. In the poem describes Cupid not as a liar, but as someone who can take on an assumed identity.
