Options;
(a) Copper-plates
(b) Epigraphy
(c) Official seal
(d) Inscription
Answer:
(a) Copper-plates
Explanation:
Historical evidence confirms that copper-plates were indeed used to sell
or purchase or donate a piece of land .This government document was in the form contained a title-deed engraved on a copper-plate.
As a reference, you can find an image example of ancient times copper-plates online.