Which of the following was a development that helped Europeans conduct long voyages

someone or something lol

letter a is the answer

(b) britain had a much larger navy than the u.s.

(d) the u.s. had a small army compared to britain.

john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.