The correct options are
A India has the largest coastline that is in contact with the ocean.
C India supports the trade in countries through the eastern and western sea routes.
D India is the central location linking trades in East and West Asia.
At about 22º N latitude, the mainland of India begins to taper. It keeps getting narrower and extends towards the Indian Ocean in the South. India has the longest coastline in the Indian Ocean. This facilitates the trade between East and West Asia.