The correct option is C espionage
Alauddin Khilji belonged to the Khalji dynasty and was the most powerful ruler of his dynasty and one of the Sultans of Delhi Sultanate. He wanted to control the conspiring nobles for which an efficient spy network was set up that reached into the private households of nobles. Apart from this, he reduced the economic wherewithal of nobles to launch rebellions by confiscating their wealth and removing them from their bases of power.