Explanation:

- Option 4: Erode

- Srinivasa Ramanujan was born on December 22, 1887, in Erode, a small town in Tamil Nadu, India.

- Option 1: Madras (now Chennai)

- This is a major city in Tamil Nadu, but Ramanujan was not born here. It was where he later pursued his mathematician career activities.

- Option 2: Kumbakonam

- Ramanujan moved to Kumbakonam at a young age with his family, which is where he spent part of his childhood and attended school.

- Option 3: Namakkal

- Namakkal is another town in Tamil Nadu, but it has no specific link to Ramanujan's birthplace.