D. When you want to join 2 independent clauses where the second clause explains the first.
I would also have to say that B is the answer. Why, I'm not sure.
it is subject because teacher is a subject
This is a fragmant of President Lincoln´s speech of March 4th, 1865, during his second inaugural address, in which he refers to the Civil War. Due to the tone of the message, is evident that President Lincoln wants to send a general message of reconciliation and peace. This is evidnet in the cited lines, in which he is trying to explain that after all, the outcome of the war couldn´t really be anticipated by any of the parties, particularly in the lenght and magnitude of the war.
Answer: The potential energy stored when the weighted end of the pendulum is paused at one point, it is converted to kinetic once in motion, so when going from one point to the other it becomes kinetic.
Explanation: