(b) 1, 3, 4 and 6
After the decline of the Guptas, the Later Guptas succeeded as the rulers of Magadha during the early seventh century. They ruled parts of the northern Including Magadha (current day Bihar). Hence statement 1 is correct.
The Paramara dynasty ruled the western and central parts of India including Malwa, between the 9th and 14th century AD, before being captured by Delhi Sultanate rulers. Hence statement 2 is not correct.
The Pushyabhutis of Thanesar (current day Haryana) ruled various parts of Northern India during the 6th and 7th century AD. Hence statement 3 is
correct.
The Maukharis dynasty ruled over parts of Uttar Pradesh and Magadha including Kannauj. The dynasty ruled till around 606 AD when it was reconquered by the Later Guptas. Hence statement 4 is correct.
The Yadavas of Devagiri ruled from around 1187 to 1317 AD in western parts of India. Hence statement 5 is not correct.
The Maitrakas of Valabhi ruled western and northern parts of current-day Gujarat during the late 5th century to late 8th century AD. Hence statement 6 is correct.