The correct answer is option 'D) Maharana Sangram Singh'. Let's understand why Maharana Sangram Singh, popularly known as Rana Sanga, ascended the throne of Mewar in 1509 A.D.

Rana Sanga's Background:
Rana Sanga was born in 1482 and belonged to the Sisodia dynasty, which ruled the kingdom of Mewar in Rajasthan. He was the eldest son of Rana Raimal and was groomed to become the king of Mewar from an early age. Rana Sanga was known for his valor, military tactics, and his determination to protect the independence of his kingdom.

Rana Sanga's Ascendancy to the Throne:
In 1509 A.D., after the demise of his father Rana Raimal, Rana Sanga ascended the throne of Mewar. He became the 40th ruler of the Mewar dynasty. Rana Sanga's reign was marked by several significant events and battles.

Rana Sanga's Military Campaigns:
1. Battle of Khanwa (1527): One of the most important battles fought by Rana Sanga was the Battle of Khanwa in 1527. In this battle, he faced the forces of the first Mughal Emperor, Babur. Despite his valiant efforts, Rana Sanga was defeated, and this battle marked the expansion of the Mughal Empire into North India.

2. Alliance with other Rajput Kingdoms: Rana Sanga believed in the unity of Rajput kingdoms and formed alliances with other Rajput rulers to resist the Mughal expansion. He formed a grand alliance known as the Rajput Confederation, which included rulers from Mewar, Marwar, Bikaner, and other Rajput states.

3. Battle of Dholpur (1519): Rana Sanga fought the Battle of Dholpur against the Lodhi dynasty of Delhi. He emerged victorious in this battle and expanded his influence in the region.

4. Resistance against Ibrahim Lodhi: Rana Sanga also resisted the rule of Ibrahim Lodhi, the last Sultan of the Delhi Sultanate. He challenged Lodhi's authority and sought to establish his own supremacy in North India.

Rana Sanga's Legacy:
Rana Sanga's reign and his battles against foreign invaders left a lasting impact on the history of Rajasthan and India. Although he faced defeats in some battles, his bravery and determination inspired generations of Rajput warriors. Maharana Pratap, one of the most celebrated Rajput rulers, was his descendant and carried forward the legacy of resistance against the Mughals.

In conclusion, Maharana Sangram Singh, popularly known as Rana Sanga, ascended the throne of Mewar in 1509 A.D. He was a valiant ruler who fought several battles to protect the independence of his kingdom and resist the expansion of foreign powers in North India.

Sangram Singh I, also known as Rana Sanga or Maharana Sanga, was an Indian monarch of the Sisodia dynasty who was born in 1482 and passed away in 1528 CE. He ruled Mewar, the historic Guhila (Sisodia) kingdom in present-day northwestern India.