The correct options are
B Onset of moisture laden winds
C Violent thunderstorms
In the month of June, monsoon winds start blowing towards the Indian subcontinent. This marks the beginning of the monsoon season. It is called the advancing monsoon or the rainy season. Around its arrival, normal rainfall increases suddenly and continues for several days. This sudden onset of moisture-laden winds associated with violent thunder and lightning, is often termed the “burst” of the monsoon.