Read this sentence from "Why I Write" by George Orwell.

For this and other reasons I was somewhat lonely, and I soon developed disagreeable mannerisms which made me unpopular throughout my schooldays.

How does the author's use of the phrase "disagreeable mannerisms" affect the tone?
A It emphasizes the contrary tone of the narrative.
B It stresses the proper tone of the narrative.
C It highlights the defensive tone of the narrative.
D It illustrates the exuberant tone of the narrative.