Which of the following options BEST\u00A0supports Lincoln\u2019s letter?

In Lincoln\u2019s letter, he is stating that the war was initiated in order to save the Union and that the goal was not to save or to destroy slavery. Thus, the only option that supports Lincoln\u2019s letter is: Lincoln\u2019s objective was to save the Union. The result of the war was the emancipation of the slaves, but this was not what was stated as Lincoln\u2019s objective.