Answer:
B. By reminding the country of its vow to protect Vietnam.
Explanation:
Because in each section, their is a constant add on that the USA vowed and promised to protect and help Vietnam.
and I just took the test anyways so...
President Abraham Lincoln's Second Inaugural Address (1865)
On March 4, 1865, in his second inaugural address, President Abraham Lincoln spoke of mutual forgiveness, North and South, asserting that the true mettle of a nation lies in its capacity for charity. Lincoln presided over the nation's most terrible crisis.
I could be wrong
A counterargument is an argument or set of reasons put forward to oppose an idea or theory developed in another argument. when used properly, counterarguments are useful because they strengthen your argument. it gives you a chance to respond to your readers objections before they are finished reading and it shows that you are a reasonable person who can see both sides of a debate before deciding your opinion. these points all help make an essay more persuasive.