The correct option is D Trilocular ovary
In Liliaceae family, the ovary is superior and trilocular, with two to many ovules in each loculus. The gynoecium has three fused carpels, i.e., tricarpellary, syncarpous condition. Liliaceae exhibit axile placentation. In axile placentation, the ovules are found attached to the axial placenta in a multilocular ovary.
Monocarpellary is the condition when only a single carpel is present. When there is more than one carpel, they may be free, known as an apocarpous condition. In marginal placentation, the placenta forms a ridge along the ovary's ventral surface and the ovules are held on this ridge in two layers.
Hence, the trilocular ovary is the only answer choice that defines family Liliaceae.