How old it is compared to another specimen in relation.
It is definitely not a primary source: this would be a book itself.
Now, is it a tertiary source? I don't think so: the author of the review should have read the book and should only be referring to this book in the review.
I think it's a secondary source.
Beneatha lost her faith on her youthful idealism. She always mocks Asagai’s idealistic dream for African independence. She no longer support African heritage and she thinks more about the problem of Africa is facing. She has a dream of going to medical school which may not happen anymore.