I think Answer is A.
Statement 1: Both diagonals are 5. Only time that will happen is if the rectangle is a square. now lets say each side = a.
Therefore a * Rootover2 (diag of a square) = 5
solve for a and you get the side.
this is not correct. Even diagonals of a rectangle are equal since opposite sides are equal.
hence both diagonals are sqrt(a^2 + b^2) where a and b are sides of a rectangle.