What is the source of the allusion in the sentence below?
"Trisha is such a Pollyanna!" Kendrick announced with a sigh.

 - British history
 - literature
The source of the allusion Pollyanna is literature.
The character Pollyanna, from Eleanor Porter's children's book, is a young girl who finds good in everything and everyone.
The allusion Pollyanna means an overly optimistic person.