To prove that quadrilateral ABCD is a parallelogram, one of the properties you can check is that the diagonals bisect each other. If EB and ED are segments that connect points on the diagonals of the quadrilateral, for ABCD to be a parallelogram, it must be true that EB must be the same length as ED. This means:
EB must be the same length as ED.
This property indicates that the segments connecting the intersection point of the diagonals bisect each other, which is a characteristic of parallelograms. Thus, the first option is the correct response.