Solution:A cyclone is a large scale air mass that rotates around a strong centre of low pressure. They are usually characterized by inward spiralling winds that rotate counterclockwise in the northern hemisphere and clockwise in the southern hemisphere.The cyclones affect the Bay of Bengal and Arabian sea. More cyclones get formed in the Bay of Bengal due to low pressure, generated by high temperature. These cyclones move in anticlockwise direction. There are two definite seasons of tropical cyclones in the North Indian Ocean.
One is from May to June and the other from mid-September to mid-December. May, June, October, and November are known for severe storms. The entire east coast from Odisha to Tamil Nadu is vulnerable to cyclones with varying frequency and intensity. Hence, Statement (a) is correct.