I think the answer would be a because there would be more attention brought to the subject.
Answer:
Esperanza admires Marin because "she is older and knows lots of things". Marin is worldly, and flaunts a sense of sexuality that the younger girls are only beginning to discover. Marin also has dreams of escaping Mango Street, and appears to the others to have options which will allow her to do that.
The answer would be - slang words and phrases. American and British English often differ greatly in such words as: highway (AmE) = motorway (BrE), or cookie (AmE) = biscuit (BrE), or diaper (AmE) = nappy (BrE), etc.