The question is asking about the diagonals of a parallelogram.
A sketch of the parallelogram is shown below:
Now, what we can notice about the parallelogram diagonals AC and BD is that, they are not equal.
The parallelogram also has two triangles OAD and OBC that are mirror images of each other.
Also, OAB and ODC are mirror images of each other as well.
This means that the OA = OC, OB = OD. Therefore, it is obvious that the two diagonals intersect at a point that divides both diagonals into two equal parts.
Therefore the diagonals of parallelograms bisect