While doing your research, all of the following would be good secondary sources to use to develop a general overview about the vietnam war, except:

a.
the encyclopedia britannica
b.
an interview with a veteran of the war
c.
a textbook on the history of the 20th century
d.
an online resource such as ‘wikipedia. org’ or ‘’

It is actually A. THE ENCYCLOPEDIA BRITANNICA  because think about it letter b would actually help you, c would actually help to because in a textbook about what happened in the war in the 20th century. It isn't scientist or historicans online.

it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.

explanation:

the answer to your question is d because the clause conveys the tone of the man in the excerpt, which is arrogant and cocky. hope that .