Correct Answer: (d) Commercial Horticulture
Solution:Fruits, spices, vegetables, shrubs, flower and turf are cultivated under commercial horticulture. Tea, coffee, sugarcane, rubber etc. are also cultivated under commercial horticulture. Large amount of human labour is required in commercial horticulture than other agriculture practices as continuous supervision of commercial crops (tea, coffee etc) is an essential factor of commercial horticulture.