Question

what is the source of the allusion in the sentence below? in response to his position on taxes, some journalists accused the candidate of engaging in doublethink.
options: a song, greek history, literature

Explanation:

The term "doublethink" is a concept from George Orwell's 1984, which is a work of literature. So the allusion to doublethink comes from literature. The other options (a song, Greek history) are not related to the origin of "doublethink".

Answer:

literature