The correct option is A Mauryans
The Mauryans preceded the Guptas, Kushans and Shakas. The Mauryans were a larger dynasty in terms of size, magnitude and authority. The Mauryan decline saw kingdoms like the Shakas and Kushans rise in the north-west regions besides the Guptas. Thus, Guptas, Kushans, Shakas came to power post the decline of Mauryan dynasty.