An action that sets a benchmark for similar situations as they arise in the future is known as a A - executive order
B - guideline
C - tradition
D - precedent

b

Explanation:

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explanation:

the quote by walter cronkite contributes to the central idea of the text by supporting the central idea. cronkite argues that what is deemed “right” for and in america may not be good for other countries. this supports the central idea of the text, that the vietnam war was unpopular in america for multiple reasons- including cronkite’s.