Which of the following was the wonderful discovery made by Hippalus in A.D. 45, leading to increasing of trade with Rome?
Which of the following was the wonderful discovery made by Hippalus in A.D. 45, leading to increasing of trade with Rome?
(a) Fitting of sails to the ships
(b) Propelling of ship with mechanical aid
(c) The existence of the monsoon winds, blowing across the Indian Ocean
(d) A shorter route for Rome to the eastern coast of India
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