"If my house was burning down, and I had to rescue one thing that wasn't money or important documents, it would be my iPhone! Not only is it slim and lightweight, it never leaves my side and everything I need to accomplish can be done in a touch of a button. It is easier to name off things it cannot do!
Well, despite the fact that you haven't provided me with sentence 8 for review, I can -- fortunately for you -- say that option B MUST be the correct answer ... based solely on pure logic and a strong command of English.