At which of the following Harappan sites was the prehistoric archaeological evidence of a systematically ploughed field discovered?
Kalibangan in Rajasthan, situated on the dried bed of the ancient Ghaggar river, revealed pre-Harappan ploughed fields, fire altars, and black clay bangles. [Memory Trick: Wear black bangles ('Kali Bangles' = 'Kalibangan') while working in the black agricultural field.]