In the United States, Which of the Following Was Not

In the United States, which of the following was not a reason for opposition to the Mexican-American War?

A) Mexico's army was four times the size of American forces and would therefore be unbeatable.
B) The war was being fought over territory that the United States had never claimed.
C) The president had undercut congressional authority by announcing that the war already existed.
D) A mere border incident was being used as an excuse to provoke a war to acquire more slave territory.
E) The president was precipitating the nation into a fathomless abyss of crime and calamity.