Among six books i.e. – A, B, C, D, E and F kept in library shelf of different size. Book A is kept at that shelf which is only less in size than shelf in which book D is kept. Only three shelfs are less in size than shelf in which book C is kept. Shelf in which F is kept is less in size than shelf in which E is kept. Book F is not kept at the lowest shelf. If size of shelf in which book E is kept is 16 cm², then which of the following may be the size of shelf in which book B is kept?