The right option is; C. Tax officials used them as receipts for payment of taxes.
Archaeologists believed that tax officials used signature seals as receipts for payment of taxes.
Signature seals are stamps which creates an impression on a piece of paper such as letters, contracts, official paperwork, important documents or arts. Seals are composed of two elements which are; a die that has an inverted image of the seal, and another die which is usually an ink. Different seals are used for many purposes. Signature seals can be used as company seals, or to seal letters that contains private or confidential information.
