Assertion: Indian archaeologists have tried to locate more sites of Harappan Civilisation in India.
Reason: Because of the partition of India, the major sites are now in India.

The Assertion is correct but the Reason is incorrect.

The correct answer is Option 4 - The Assertion is correct but the Reason is incorrect.

The reason is incorrect as because of the partition, the major sites are now in  Pakistani territory not India.

The frontiers of the Harappan civilisation have little or no connection with present-day national boundaries. However, with the partition of the subcontinent and the creation of Pakistan, the major sites are now in Pakistani territory. This has spurred Indian archaeologists to try and locate sites in India. An extensive survey in Kutch has revealed a number of Harappan settlements and explorations in Punjab and Haryana have added to the list of Harappan sites. While Kalibangan, Lothal, Rakhi Garhi and most recently Dholavira have been discovered, explored and excavated as part of these efforts, fresh explorations continue.