When writing an argumentative essay, what is the most important reason authors conduct research?
to find statements that express their opinion
to find evidence to support their arguments
to find statements of other people’s opinions
to find long quotations to include in the essay

The correct answer of the given question above would be the second option. When writing an argumentative essay, the most important reason why authors conduct research is to find evidence to support their arguments. Writing an argumentative essay requires further investigation of the topic. 

The statistics for the eastern war are grim. more than three-million men died in the fighting, more than nine-million men were wounded, and every major country which participated lost its form of government.