The answer is a because when you’re dealing with positive Powers you do the one on the left first and when you do the one on the left you divide the second number by two and the second number 8 so now it is four. The one on the right you double the second number by two and the second number was four so now it is eight and when the number outside of the parentheses is negative you don’t do anything with it so that is why your answer is a. (And also five and four you keep the same because when even one of them has a negative in them you keep the two main numbers the same which are five and four.)