Evidence of a ploughed field, with furrow marks, has been found at which Harappan site?

A ploughed field with furrow marks, belonging to the early (pre-Harappan) phase, has been found at Kalibangan, in the Hanumangarh district of Rajasthan.

About the ploughed field:

• The field shows two sets of furrows at right angles to each other, forming a grid pattern.
• This suggests that two different crops were grown together in the same field ("mixed cropping"), a practice still followed in the region; for example, mustard and gram.
• It is one of the earliest ploughed fields found anywhere in the world.

About Kalibangan:

• "Kalibangan" means "black bangles", because of the many broken pieces of black bangles found on the surface.
• It is located on the left bank of the Ghaggar river (ancient Saraswati), in northern Rajasthan.
• It was first identified by the Italian scholar Luigi Pio Tessitori in the early 20th century.

It was excavated by B. B. Lal and B. K. Thapar of the ASI in the 1960s.

It shows both early Harappan and mature Harappan phases.

Its main features:

• A citadel and a lower town, both fortified.
• Houses built of mud bricks, unlike the burnt bricks of the larger cities.
• Evidence of an earthquake, one of the earliest recorded in archaeology.
• Burials of different types, including circular pits and rectangular graves.
• Other finds include seals, a cylindrical seal, terracotta objects, and a tiled floor with decorated tiles.

Harappan agriculture:

• The Harappans used ploughs, probably drawn by oxen.
• Crops included wheat, barley, lentils, chickpeas, mustard and sesame.

Why not the other options?

• ✗Mohenjo-daro, Chanhudaro and Amri are in Sindh; none has the ploughed field.