The use of submarines during world war i had which of these effects? it gave an advantage to the coastal nations.
it made naval battles the key battles of the war.
it made it difficult for merchants to bring supplies to the allies.
it prevented the central powers from transporting troops.

The best and most correct answer among the choices provided by your question is the second choice or letter B.

The use of submarines during World War I had made naval battles the key battles of the war.

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Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.