Answer:
An emotional appeal.
Step-by-step explanation:
The given excerpt is taken from the Inaugural speech of President John F. Kennedy. The speech was delivered on 20th January 1961.
The rhetorical device that Kennedy has used in the given excerpt is pathos. Pathos is an emotional appeal to an audience. An orator uses this an emotional appeal in his speech to persuade and connect with his audience on an emotional level.
In the given excerpt, Kennedy is trying to connect with his audience on an emotional level by promising and committing to bring justice and peace. This can be understood in the context that Kennedy became President during the time of the Cold War. Thus, the main idea in his speech was to ensure his audience that he will do his best as a President to bring peace and justice in the world. That is why he is trying to connect with his audience emotionally so that his people may trust him.
So, the correct answer is an emotional