Explanation: To understand the statements in this question, we need to delve into the specifics of Indian geography, Mughal history, and Islamic architecture.
1. **The World's Largest Sundial**: The world's largest sundial is located in Jantar Mantar, Jaipur, India. Jantar Mantar is an astronomical observatory built by Maharaja Jai Singh II of Jaipur in the early 18th century. The sundial, known as the Samrat Yantra, is a massive structure that can tell the time to an accuracy of about two seconds. This statement is true.
2. **Muhammad bin Tughlaq's Empire vs. Akbar's Empire**: Muhammad bin Tughlaq, who ruled the Delhi Sultanate from 1325 to 1351, had an empire that was larger in terms of geographical extent compared to Akbar's Mughal Empire. Akbar, who ruled from 1556 to 1605, had a more consolidated and centralized empire, but the territory under Muhammad bin Tughlaq's control was more expansive. This statement is true.
3. **Quranic Inscriptions**: Quranic inscriptions on buildings were often written in decorative scripts, particularly the Kufic script. Kufic is a style of calligraphy that is angular and geometric, often used for decorative purposes. The statement that Quranic inscriptions were in straight script is incorrect. Straight script, or a more linear and less decorative form, was not typically used for Quranic inscriptions in Islamic architecture.
In summary, the correct answer is (A) Only 1, 2. The first two statements are true, while the third statement is false. Understanding the historical context and architectural details is crucial for correctly identifying the true statements.