Explanation
The duration of the reign of Peshwa Baji Rao I was from 1720 to 1740.
Option A, 1668-88, does not apply to Peshwa Baji Rao I, but rather to the reign of Mughal Emperor Aurangzeb.
Option B, 1728-48, also does not apply to Peshwa Baji Rao I, but rather to the reign of his son, Peshwa Balaji Baji Rao.
Option D, 1660-80, is also incorrect, as this timeframe predates the reign of Peshwa Baji Rao I. The early Peshwas were appointed by the Maratha king Shivaji in the late 17th century, but Baji Rao I did not become Peshwa until 1720.
