Power because without power you cant,impact,control or influence others ,you would need power to do so and am notbtalking about power as in physical strength,power makes you possess ans exercise authority
Intrasitive is the answer for sure
B is correct, "<span> Christina and I went to the same summer camp for years (since we were 8)" </span>parentheses are used when you have some extra information you want to add, but its not completely necessary. Like how they started going to the same summer camp when they were 8, you can still read the sentence fine without it, but it's a nice piece of information.
I haven't read this but I believe the answer is A.