This is a test of commonsense with single/multi-choices. Complete the next sentence:

Several people are captured decorating a christmas tree in a living room in a fast forward, speed motion video. A christmas tree stands undecorated in a living room. two people

OPT:
[a]. brush the christmas tree with powder.;
[b]. are then shown cutting the tree up and sweeping the base with a rake.;
[c]. decorate the tree with a light cord.;
[d]. walk through the door and up stairs and go to the patio.;
The answer is:
[c].