Read the excerpt from John F. Kennedy's inauguration speech in January 1961. Then answer the question.
In a paragraph of 3–5 sentences, describe what John F. Kennedy believed
was an important responsibility for all Americans. How were his policy goals -
different from those of his predecessors? Include specific examples or quotes from the speech.
(I answered it but it won’t let me answer existing questions)

i need to see the answer to answer the question

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation: