The correct option is
D Malvaceae
Malvaceae family is used for obtaining cortical fiber used for cordage, ropes, and floor covering. Cotton also belongs to this family and is used for making cotton fiber.
Solanaceae family is also known as potato family and includes many vegetable crops, such as brinjal, potato, tomato, green pepper, Shimla pepper etc. as well as drug plants, like tobacco.
Cruciferae is mustard family or cabbage family which includes vegetable and oilseed crops mainly.
Poaceae is grain producing family and most important source of flour, cereals, sugar, and alcohol for human as well as serve as fodder for animals that consume grass.
So, the correct answer is option A.