The correct answer is A. The speaker's tone is troubled but intrigued.
We can tell the speaker is troubled because she says, "I did not know what to do." She says she shouldn't be seen with the girl and that she does not want to be walking with her. Therefore, she is troubled.
However, she is also intrigued, which is why she continues to walk with her. The speaker says, "on the other hand, the flattery of those humble, hopeful turnings was not lost on me." Ultimately, the speaker "could not resist" continuing along.
Therefore, the speaker's tone is troubled but also intrigued.
