By the early 20th century, britain had built the world's most respected navy because

it needed to protect its vast overseas empire

Explanation:

From the late 17th to the mid-20th century, Britain's navy was the most powerful navy in the world, playing a key role in establishing the British Empire as the dominant world power. Great Britain invested heavily in naval force as a way to protect and maintain the supremacy of its vast overseas empire

i thing that the best option is a.they feared it would cause a second economic collapse.

one of the most negatives aspects of the new deal was that it upset the balanced federal budget and led to a huge deficit for the nation while at the same time failed to end increasing unemployment. roosevelt's program, based on keynesian theories of economics, called for massive government spending to stimulate the economy. as he   failed to do this with large tax increases; large sums of money were borrowed to fund new deal programs. when the economy showed some improvement, roosevelt was concerned about inflation, and ordered cuts in government spending. unfortunately, he did so at a time when the new social security tax had cut people's disposable income. businesses were too afraid of spending, and the economy in 1937 was in worse shape than in 1929. at the end of that year, two million people were unemployed.