Epigynous and unisexual flowers are found in members of family
A. Caryophyllaceae is commonly known as the pink family or carnation family is a family of flowering plants.
B. Campanulaceae is in the bellflower family, and containing 84 genera. And about the 2,400 species of mostly herbaceous plants, many with showy, blue, bell-like flowers.
C. Myrtaceae means the myrtle family is the family of the dicotyledonous plants and which are placed within the order Myrtales.
D. Epigynous and unisexual flowers are found in members of Cucurbitaceae. In epigynous flowers, the receptacle develops to form a cup that is united with ovary wall so that other floral parts appear to be grown on the top of the ovary.
So the answer is option D.