Lincoln's main objective in the Civil War was to have a superior military to the Confederacy in order to preserve the Union. While he wanted a superior military, he did not want to lose the border states by announcing that he was against slavery, as this would hamper his goal towards building a military.
The answer is C. he was pro-slavery, as he eventually released the Emancipation Proclamation in 1863 that freed all slaves in the South.
The answer to this would be Cars.
Hope I helped.
-Davismr00.
The Zimmerman telegraph, was a telegraph from Germany to Mexico proposing an alliance in which Germany would give the land that Mexico lost to the United States if the Mexican people would fight the United States and keep them out of the war