Explanation:

According to epigraphic evidence, we have references of measurement units such as – “Kulyavapa”, “dronavapa”, “adhavapa” and “Pataka” from Bengal, nivratana” and “bhumi” from Central India and “nivartana and “padavarta” from Western India. In many insciptions the land is indicated by a term denoting the measures of seed which could be sown on it. Some of the Gupta records refer to the expression Kulyavapa as a denomination of land measurement. Dronavapa also is an area of land requiring one drona measure of seed grains to be sown. Hence option 1st is correct.