Explanation:

Options B, C and D existed much prior to 6th century, so they can’t be the answer.The institution is considered to belong properly to the Gupta Empire, however, some vague evidence is found in South India as well.The Samanta in South-India was used to mean a vassal to an emperor. In North-India, the earliest use of the term in a similar sense was in Bengal where someone was described as Samanta-Chudamanih (best among feudatories) of the imperial Guptas.The Samanta vassal provided military support to the Monarch and governed over a portion of a territory.
Learning: The term Indian feudalism is used to describe zamindar, jagirdar, sardar, mankari, deshmukh, chaudhary and samanta.In this system, a nobility gave the emperor military services in exchange of land.There was a separate class of labourers or peasants who were provided military protection in exchange of labour and share of their produce. They were allowed to live on the lord’s land.