. . . . . . . . is the most convenient method of classification of vegetables.

Answer: Option C

In this classification, all the vegetable crops requiring similar cultural requirements are grouped. This method of classification is of much practical value for farmers and students of Olericulture.
Based on culture is the most convenient method of classification of vegetables and these are:
Cole crops, leafy vegetables, salad vegetables, Root vegetables, cucurbit crops, solanaceous crops, pea and beans (Pod vegetables), bulb vegetables, perennial vegetables and tuber vegetables.