49. According to the text, what is the specific role of "peripheral features" in English as an International Language? (A) They act as barriers that prevent effective communication between different L1 speakers. (B) They allow speakers to express and exchange their distinct cultural identities and lifestyles. (C) They serve as the primary grammar rules that all beginners must master first. (D) They represent errors that will eventually be phased out as English continues to develop.