D. Seeing the happy times of his youth upsets Scrooge because he knows that they are gone now. Scrooge, I guess missed those times and didn't want to be reminded of them ~.~ Hope it helps! :)
D. <span>Seeing the happy times of his youth upsets Scrooge because he knows that they are gone now. Scrooge is pretty miserable in his current life. Also, A B and C don't make sense because for A he remembers being there when he was younger, so it's not something he imagined, B has nothing to do with the story really and C Scrooge was very happy in his younger days. So D is the correct answer.</span>
I think the appropriate response to the question above is Synergistic. It implies relating to the association or participation of at least two organizations, substances, or different specialists to deliver a joined impact more prominent than the total of their different impacts.
