The correct option is C Monsoon
Despite the broad unity of the monsoon type of climate, variation in climate occurs in different regions of the country. For example, the climatic conditions of Bihar and Uttar Pradesh in the north differ from that of Kerala and Tamil Nadu in the south; yet all of these states have a similar monsoon type of climate. These variations are expressed in the form of winds, temperature and rainfall, rhythm of seasons and the degree of wetness or dryness. These regional diversities are known as the sub-types of monsoon climate.