Step 1: Story context.
In "Love Defiled," the narrator observes that the girlfriend's cunning nature had not influenced him.
Step 2: Option analysis.
(A) goodness: Incorrect.
(B) selfish: Incorrect.
(C) generous: Incorrect.
(D) cunning: Correct, matches the story.
Step 3: Conclusion.
Correct answer is (D) cunning.