Which part of Madhya Pradesh has the high variability of rainfall?

Rainfall in Madhya Pradesh decreases from the south-east towards the north-west. The north-western part of the state — the Chambal tract covering districts such as Bhind, Morena, Gwalior and Datia — is a semi-arid, low-rainfall zone (annual rainfall below roughly 750 mm) influenced by rain-shadow conditions and an erratic monsoon. Because the total rainfall is small and the monsoon is unreliable, this region shows the highest year-to-year variability of rainfall in the state. Hence the correct answer is the North West part.