The correct option from given options is; "B", "Angle ATB is congruent to Angle CTB".
In a quadrilateral ABCD, the diagonals bisect each other at point T, it means that the angle ATB correspond to the side AB and the angle CTB correspond the side BC,it means that the angle ATB is congruent angle to CTB and from this it result that the side AB is congruent side BC.