The correct answer is: b) 1573.
Akbar, the third Mughal emperor, conquered Gujarat in 1573. He had been planning the conquest for several years, and he finally launched his attack in 1572. The Mughal army was victorious, and Akbar took control of Gujarat. The conquest of Gujarat was a major turning point in Akbar’s reign. It gave him control of a wealthy and strategically important province, and it helped to consolidate his power in northern India.
Option a) is incorrect because Akbar became the Mughal emperor in 1556, but he did not conquer Gujarat until 1573.
Option c) is incorrect because Akbar died in 1605, and he had already conquered Gujarat by that time.
Option d) is incorrect because Akbar was not alive in 1645.