Explanation:

- Option 1: Visit of Chinese pilgrim Hiuen Tsang

- Hiuen Tsang visited India during the reign of King Harsha in the 7th century, which is after the Gupta Age.

- Option 2: Significant contribution to Indian astronomy by Aryabhatta

- Aryabhatta was a prominent mathematician and astronomer during the Gupta Age. His work, Aryabhatiya, made significant contributions to astronomy.

- Correct Answer: Significant contribution to Indian astronomy by Aryabhatta

- Option 3: Significant contribution to poetry and literature by Banabhatta

- Banabhatta wrote during King Harsha's reign, after the Gupta period.

- Option 4: Macedonian invasion

- This refers to Alexander the Great's invasion, long before the Gupta Age.