The term "iron tyranny" refers to

The term iron tyranny refers to the arbitrary and unrestrained use of the power vested by the people.

Explanation:

Iron tyranny was a term that was used by John F Kennedy in the inaugural address of his Presidency to deride the opponents and their wish to overpower the sentiment of the people and to also contrast himself with them by making that comparison and by the virtue of it too.

The comparison that was drawn here was that the powers opposite wanted to have arbitrary and unrestrained access to the power vested by the people to the President.

The address worked and conveyed the message effectively.

the captain of a steam ship naturally chooses the shortest route to his destination. since a sailing ship is usually pushed by winds and currents, its captain must find a route where the wind will probably blow in the right direction. tacking, i.e. using contrary wind to pull (sic) the sails, was always possible but wasted time because of the zigzagging required, and this would significantly delay long voyages. the early european explorers were not only looking for new lands. they also had to discover the pattern of winds and currents that would carry them where they wanted to go. during the age of sail winds and currents determined trade routes and therefore influenced european imperialism and modern political geography. for an outline to the main wind systems see global wind patterns.

pilotage or cabotage, in one sense, is the art of sailing along the coast using known landmarks. navigation, in one sense, is the art of sailing long distances out of sight of land.[1] although the polynesians were able to sail the pacific (with great difficulty) and people regularly sailed north and south across the mediterranean, before the time of columbus nearly all sailing was coastal pilotage

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increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b