Answer:
2
Explanation:
Well by definition a Rhombus is an equilateral paralelogram, AB =BC=CD=DA with all congruent sides, and Diagonals with different sizes.
Also a midpoint is the mean of coordinates, like E is the mean coordinate of A,C, and B, D

So the sum of the Coordinates B and D over two returns the midpoint.
And subsequently the sum of the Coordinates B +D equals twice the E coordinates. The same for the sum: A +C
Given to the fact that both halves of those diagonals coincide on E despite those diagonals have different sizes make us conclude, both bisect each other.