The correct option is D All of the above
Spices are flavouring agents. Many parts of a plant i.e., seed, fruit, bark, stem, flower can be used as spices. For example, Piper nigrum (black pepper) fruit is used as spice, Eugenia caryophyllata (cloves) flower is used as spices,and brassica juncea (mustard seeds) seed are used as spices. Thus, the correct answer is option D.