The correct answer is (c) Harappa.
Harappa is an archaeological site in the Punjab province of Pakistan. It is one of the most important sites of the Indus Valley Civilization, and is one of the world’s earliest urban settlements. The site was first excavated in the 1920s, and has since been the subject of extensive research.
One of the most significant discoveries at Harappa was a ploughed field. The field was found to be located near the city’s main street, and was dated to around 2600 BC. The discovery of the ploughed field provides evidence that the Indus Valley Civilization had a sophisticated agricultural system.
The other options are incorrect because they are not sites where a ploughed field has been discovered.
(a) Mohanjodaro is an archaeological site in the Sindh province of Pakistan. It is another important site of the Indus Valley Civilization. However, no ploughed field has been discovered at Mohanjodaro.
(b) Kalibanga is an archaeological site in the Rajasthan state of India. It is a smaller site than Harappa and Mohanjodaro, and is not as well-known. No ploughed field has been discovered at Kalibanga.
(d) Lothal is an archaeological site in the Gujarat state of India. It is a port city that was part of the Indus Valley Civilization. No ploughed field has been discovered at Lothal.