The correct answer is option 4: 1, 2, and 3.

Let`s analyze each statement to understand why they are correct.

Statement 1: Amir Khusrau was a contemporary of Ala-ud-din Khilji.

This statement is correct as Amir Khusrau, a renowned poet, musician, and scholar, lived during the reign of Sultan Ala-ud-din Khilji in the 13th and 14th centuries.

Statement 2: Amir Khusrau invented the musical instrument Sitar.

This statement is correct. Amir Khusrau is often credited with the development or refinement of the sitar, a stringed musical instrument widely used in classical Indian music.

Statement 3: Dara Shikoh translated the Upanishads and Bhagavad Gita into Persian.

This statement is correct. Dara Shikoh, the eldest son of Mughal Emperor Shah Jahan, was known for his interest in religious and philosophical studies. He translated several Hindu scriptures, including the Upanishads and the Bhagavad Gita, into Persian.

Overall, all three statements are accurate, making option 4 the correct answer.