"c. She was not interested in becoming part of the popular group" is how Millicent was different a year or two before the story, since this is a major character development.
Sophisticated: having, revealing, or proceeding from a great deal of worldly experience and knowledge of fashion and culture.
If Molly looked more sophisticated wearing the business suit, that means she looked more professional/knowledgeable thus making it the better option.
Focus on mrs birling duh i think thats the awnser
