Which famine occurred in Mizoram during the year 1959? This event is followed invariably by a plague of black rats and is called rat flood.

Correct option is D

Mautam refers to a cyclical famine in Mizoram triggered by the flowering of bamboo, which leads to a surge in the rat population. The rats destroy crops, leading to famine. This event occurs roughly every 48 years.
Explanation of other options:
(a) Upper Doab: Refers to an area in Uttar Pradesh; not a famine.
(b) Skull: Not related to Mizoram or famines.
(c) Chalisa: A famine in North India during 1783-1784.