Explanation:

The southwest monsoon reaches the coast of the southern state of Kerala around June 1. It usually arrives in Mumbai approximately 10 days later, reaches Delhi by the end of June, and covers the rest of India by mid-July. The failure of the monsoon trough, or the ITCZ, to move south of the equator in the eastern Pacific Ocean and Atlantic Ocean during the southern hemisphere summer, is considered one of the factors causing tropical cyclones to not normally form in those regions.
So, Both A and R are individually true and R is the correct explanation of A.
Hence, option 1 is the correct answer.