The correct option is C Decimal system
In the ancient times, India had maintained maritime contacts with the rest of the world. Trade was maintained, as well as thoughts and ideas were shared. The Ramayana and the Upanishads, the tales of the Panchatantra, as well as the numeral system and the decimal system were shared from India. Architectural styles of majestic domes and minarets from West Asia, and the influences of Greek sculptures made their way to India.