Select the correct answer. What is the general form of the equation for the given circle?

A.
x2 + y2 − 8x − 8y + 23 = 0

B.
x2 + y2 − 8x − 8y + 32 = 0

C.
x2 + y2 − 4x − 4y + 23 = 0

D.
x2 + y2 + 4x + 4y + 9 = 0

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)