The central location of India at the head of the Indian Ocean is considered of great significance. Why?

My teacher wants this answer in 5 points but the textbook solutions in this site provides only 3 points. Please help!

The central location of India at the head of the Indian Ocean is considered of great significance because:

a. The central location of India is considered of great significance as it helps India to keep a close contact with West Asia, Africa and Europe from western coast, and Southeast and East Asia from the eastern coast.
b.
 It is also an important transit point for sea routes connecting the two regions that is countries of  Europe with countries of East Asia.
c. The strategic location of India has contributed to the exchange of ideas and commodities, through land and sea, since ancient times. 
d. Its strategic location enables India to project naval power across the arc of the Indian Ocean .
e.  India has an important position with regard to international sea routes making it potentially powerful as the country has the longest coastline on the Indian ocean.

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