Explanation:

- Option 1: Thomas Coryat

- Thomas Coryat was an English traveler and writer known for his travelogue "Coryat's Crudities" published in the early 17th century.

- He is not associated with discovering a sea route to India.

- Option 2: Megasthenes

- Megasthenes was an ancient Greek historian and diplomat, known for his work "Indica," which describes India.

- He lived in the 3rd century BCE, so he did not discover a sea route.

- Option 3: Marco Polo

- Marco Polo was a Venetian merchant and explorer who traveled extensively in Asia during the late 13th century.

- While he documented his travels, he did not discover a sea route to India.

- Option 4: Vasco da Gama

- Vasco da Gama was a Portuguese explorer who successfully discovered a sea route to India in 1498.

- His journey marked the first direct maritime route from Europe to India.