The correct answer is option 3, Rana Kumbha, who built the famous Kirtistambha at Chittor. However, let`s analyze the other options to provide a better understanding.
Option 1, Rana Ratan Singh, is not correct. Although Rana Ratan Singh was a ruler of Mewar and Chittor, there is no historical evidence to suggest that he built the Kirtistambha.
Option 2, Rana Sanga, is also incorrect. Rana Sanga was a prominent ruler of Mewar but he is not attributed to the construction of the Kirtistambha.
Option 4, Rana Sangram Singh, is incorrect as well. Rana Sangram Singh, also known as Rana Pratap, was a renowned ruler of Mewar but he did not build the Kirtistambha at Chittor.
Therefore, the correct answer is option 3, Rana Kumbha. Rana Kumbha was a notable ruler of Mewar and is credited with the construction of the iconic Kirtistambha, also known as the Tower of Fame, at Chittor.