The correct answer is a measurement of land.

• The agricultural crops constituted the main resources which the society produced and the major part of the revenue of the state came from agriculture.
• Various types of land are mentioned in the inscriptions; land under cultivation was usually called Kshetra, Khila was the uncultivable land, Aprahata was the jungle or forest land, Gopata Sarah was the pasture land and Vasti was the habitable land.
• Different land measures were known in different regions such as Nivartana, Kulyavapa and Dronavapa.

• The term 'vap' means 'to sow'. 
• There were various texts and inscriptions used for land measurement during the Gupta period.
• The terms for short distances were-
  • The angula (approx ¾ inch).
  • The hasta (cubit) was the standardized distance between the tip of the elbow and the middle finger (18 inches).
• The terms for large distances were-
  • Adhavapa (3/8–1/2 acre)
  • Dronavapa (1½–2 acres)
  • Kulyavapa (12–16 acres)
• The 'Kulyavapa ' was the area required to sow one kulya of grain and the 'Dronavapa' was the area required to sow one Drona of grain.
• Such a large number of land measure terms indicates that there was no single standard set of measurement and that different measures were current in different regions.