By which one of the following modes of transport, most of India's foreign trade is done?

Ocean route

The correct answer is Option (3) → Ocean route

India has a vast coastline of approximate 7,517 km, including islands. Twelve major and 185 minor ports provide infrastructural support to these routes. Oceanic routes play an important role in the transport sector of India’s economy. Approximately 95 per cent of India’s foreign trade by volume and 70 per cent by value moves through ocean routes. Apart from international trade, these are also used for the purpose of transportation between the islands and the rest of the country.