what did abraham lincoln mean by the statement, the dead, who struggled here, have consecrated it (the land) far above our power to add or detract

They made a checks and balance system to equal power within the branches. the "check" meant that one branch would watch one branch and "balance" them if they were too powerful. if you want more info on this, i would just google checks and balance system.

Ido not what so ever! 2

Iwould say c is the best answer choice