Question ID:PT21 S1 Q10 Passage:A worker will insert colored light bulbs into a billboard equipped with exactly three light sockets, which are labeled lights 1, 2, and 3. The worker has three green bulbs, three purple bulbs, and three yellow bulbs. Selection of bulbs for the sockets is governed by the following conditions:Whenever light 1 is purple, light 2 must be yellow.Whenever light 2 is green, light 1 must be green.Whenever light 3 is either purple or yellow, light 2 must be purple. Stem:If no green bulbs are selected, there are exactly how many possible different color sequences of the three lights? Correct Answer Choice:BChoice A:one Choice B:two Choice C:three Choice D:four Choice E:five