In the figure above which of the following must be true?

A. x + y = 180

B. 90 + x = 180 - y

C. 90 + x = y

D. 2x = y

E. 2y = x

I'm confuse and came up with these for each choices and need help on choosing which one is right. Thanks

A. x and y can't be 180 because the center has an 90 degree angle

B. 90 + x should equal to less than 180 right?

C. 90 + x is a large angle that should be bigger than y right?

D. 2x will be bigger then y

E. 2y will be bigger then x