The correct option is
D All of the above
Gossypium hirsutum is also known as upland cotton or Mexican cotton. It is the most widely planted species of cotton in the United States, constituting some 95% of all cotton production there.
Gossypium hirsutum includes a number of varieties or cross-bred cultivars with varying fibre lengths and tolerances to a number of growing conditions. It is one of the economically important plant in
Malvaceae.
Hibiscus cannabinus is in the genus Hibiscus and is probably native to southern Asia, though its exact natural origin is unknown. The name also applies to the fibre obtained from this plant. Kenaf is one of the allied fibres of jute and shows similar characteristics. It yields fibre, seed oil and paper. So, it is one of the economically important plant of Malvaceae.
Okra (Abelmoschus esculentus), known in many English-speaking countries, ladies' fingers, bhindi, bamia, ochro or gumbo is a flowering plant in the mallow family. It is valued for its edible green seed pods. It is one of the economically important plant of Malvaceae.
Thus, the correct answer is option D.