What, if anything, makes the following thesis statement weak?

When the protagonist of Henry James's The Portrait of a Lady, Isabel Archer, finds herself confronting swindlers eager to scam her out of her fortune, the plot reveals the author's mistrust of "new world" values over "old world" traditions, raising questions about the future of society.

a) It does not address meaning, or the "so what?"
b) It fails to provide a rationale for the position.
c) It is not arguable or defensible.
d) It is not specific.
e) Nothing; this thesis statement is effective.