The correct option is B asymmetry
In sponges, the body cannot be divided into equal parts on cutting it in any plane. So, they are called asymmetrical.
If the body of an organism can be divided into two equal halves on cutting it in one specific plane, then the symmetry is called bilateral symmetry.
If the body of an organism can be divided into two equal halves on cutting it in any plane passing through the centre, then the symmetry is called radial symmetry.
If the body an organism can be divided into equal halves on cutting it in specific two planes passing through the centre, then the symmetry is called biradial symmetry.