The correct option is D Rubiaceae
Plants with inferior ovary belongs to Rubiaceae. The corolla is sympetalous with 4-5 lobes, mostly actinomorphic, usually tubular, often white but also yellow, blue and red. The stamens are 4-5, alternipetalous and epipetalous. Anthers are longitudinal in dehiscence, but some genera are poricidal. The gynoecium is syncarpous with an inferior ovary. Placentation is axial, rarely parietal.
Therefore, the correct answer is option D.