What is the traditional use of a plough in agriculture?

Correct answer: To till the soil

The direct answer is option C: a plough is traditionally used to till the soil. Tilling means turning, loosening, and preparing the soil before seeds are sown. The plough cuts into the earth and makes it easier for roots to grow and for air and water to enter the soil. The reasoning is simple: plough enters the field soil → soil is broken and loosened → the seedbed becomes suitable for sowing. Option A is wrong because washing clothes requires water and washing equipment, not a plough. Option B is wrong because painting a house requires paint and brushes or rollers. Option C is correct because tilling is the direct agricultural function of a plough. Option D is wrong because cooking grains happens in a kitchen using heat and cooking utensils. A plough may be pulled by animals or a machine, but its purpose remains soil preparation. Memory cue: plough = prepare the plot.