I believe it is A, because it states “labor of his body, and the work of his hands... are properly his” which means that what someone create (or produce) belongs to them and own the right.
In Lincoln's mind, the railroad was part of the Civil War effort. The new line would support communities and military outposts on the frontier. ... A transcontinental railroad, Lincoln hoped, would bring the entire nation closer together – would make Americans across the continent feel like one people.
