Answer : 1. "Barley "
Explanation :

1. Remains of cotton cultivation have been found along with mixed cultivation (gram and mustard) along with barley.

2. Lines marked with a plough have also been found from Kalibanga, which proves that the humans here also did agricultural work.

3. This is also confirmed by the statues of bulls and other domesticated animals and bones of bulls and deers have also been found. Bullock cart toys have also been found.