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

Two fingers turn a silver knob clockwise on a vacuum cleaner. the person

OPTIONS: a). uses the vacuum cleaner to clean the carpet. b). turn the vacuum cleaner on and stops when the knob turns. c). pushes the emergency button with their foot. d). remove and replace the vacuum on the wall.
The answer is:
a).