Question

10 vasco da gamas discovery of a route to india by sea proved to be a far too costly to be sailed on a regular basis. b very profitable, since da gama returned with a cargo of spices and made a profit of severa c much longer than the route to india by land. d the only time any portuguese vessel sailed the route, as aborigines later attacked any ship

Explanation:

Vasco da Gama's sea - route to India was highly profitable. He returned with a cargo of spices and made a large profit. The land - route to India was long and fraught with difficulties. His sea - route was not too costly for regular sailing, not the only time Portuguese vessels sailed it, and not necessarily longer than the land - route in terms of practicality for trade.

Answer:

B. very profitable, since da Gama returned with a cargo of spices and made a profit of several times the cost of the expedition.