If the grammatical structure that is italicized is <em>although her personality had not changed at all, </em>then the correct answer is adverb clause. Adverb clauses function the same way simple adverbs do - they answer the questions such as why, where, when, how, etc.
Cities were designed to allow all houses to have access to riversfor dumping waste
I hope this helps
B is your answer I hope this helps
