The conquest of the Deccan to which the Aurangzeb devoted the last ______ years of his life?

The conquest of the Deccan to which the Aurangzeb devoted the last ______ years of his life?

A. 22
B. 24
C. 16
D. 26

Muhi-ud-Din Muhammad (3 November 1618 – 3 March 1707), commonly known by the sobriquet Aurangzeb (Persian: “Ornament of the Throne”) or by his regnal title Alamgir (Persian: “Conqueror of the World”), was the sixth Mughal emperor, who ruled over almost the entire Indian subcontinent for a period of 49 years. Widely considered to be the last effective ruler of the Mughal Empire, Aurangzeb compiled the Fatawa-e-Alamgiri, and was among the few monarchs to have fully established Sharia law and Islamic economics throughout the Indian subcontinent. He was an accomplished military leader whose rule has been the subject of praise, though he has also been described as the most controversial ruler in Indian history.
The Indologist Stanley Wolpert, emeritus professor at UCLA, says that:
the conquest of the Deccan, to which Aurangzeb devoted the last 26 years of his life, was in many ways a Pyrrhic victory, costing an estimated hundred thousand lives a year during its last decade of futile chess game warfare. The expense in gold and rupees can hardly be accurately estimated. Aurangzeb’s encampment was like a moving capital – a city of tents 30 miles in circumference, with some 250 bazaars, with a ​1⁄2 million camp followers, 50,000 camels and 30,000 elephants, all of whom had to be fed, stripped the Deccan of any and all of its surplus grain and wealth … Not only famine but bubonic plague arose … Even Aurangzeb, had ceased to understand the purpose of it all by the time he was nearing 90 … “I came alone and I go as a stranger. I do not know who I am, nor what I have been doing,” the dying old man confessed to his son, Azam, in February 1707.