Question

read the excerpt from president woodrow wilsons speech, war message to congress.
we must put excited feelings away. our motive will not be revenge or the victorious assertion of the physical might of the nation, but only the vindication of right, of human right, of which we are only a single champion.
president wilson is trying to convince his listeners that going to war is
not about emotions but about defending the nation
about showing the world the power of the nation.
not about spreading peace throughout the world
about sitting back and waiting to see what will happen.

Explanation:

The text says "We must put excited feelings away" (not about emotions) and "vindication of right, of human right" (defending the nation). The other options go against what's stated. "Showing the world the power" is denied ("not...the victorious assertion of the physical might"), "not about spreading peace" is wrong as it's about right - which could be related to a just cause (implied peace - related in a right - based sense), and "sitting back" is contrary to going to war.

Answer:

not about emotions but about defending the nation