Explanation: This question revolves around the historical accuracy of statements related to significant figures and monuments in Indian history. Let's break down each statement to understand why only statement 3 is true.
1. **Malik Kafur commanded Firoz Tughlaq's army**: This statement is false. Malik Kafur was a general in the army of Alauddin Khalji, not Firoz Tughlaq. Firoz Tughlaq was a later ruler of the Tughlaq dynasty, and Malik Kafur lived and served under a different ruler. Therefore, this statement is incorrect.
2. **Itmad ud Daula's tomb has 6 octagonal minarets**: This statement is also false. Itmad ud Daula's tomb, located in Agra, is known for its intricate carvings and is often referred to as the "Baby Taj." However, it does not have 6 octagonal minarets. The tomb is famous for its white marble structure and the intricate pietra dura work, but the architectural details mentioned in the statement are incorrect.
3. **Muhammad of Ghazni founded a University in the capital town of Ghazni**: This statement is true. Muhammad of Ghazni, also known as Mahmud of Ghazni, was a significant ruler of the Ghaznavid Empire. He was known for his military campaigns and his patronage of learning and the arts. During his reign, Ghazni became a center of learning, and he established a university in the city. This university attracted scholars from various parts of the Islamic world, making Ghazni a significant intellectual center of its time.
In summary, the correct answer is (C) Only 3, as it is the only statement that accurately reflects historical facts. The other statements contain inaccuracies regarding the historical roles and architectural details of significant figures and monuments in Indian history. Understanding these distinctions is crucial for correctly identifying historical facts and misconceptions.