Answer:
The correct option is: At sunset, the crowd watched the sky fill with shimmering bands of amber and gold.
Step-by-step explanation:
Even though all sentences describe people gathering to watch a sunset, the best choice when taking into account the use of descriptive detail and sensory words is the third one. The description of a crowd, the time of the day(sunset), the mention of the sky and its colors(amber and gold) and the description of the shimmering effect of the lights all contribute to portraying a vivid and familiar image of a colorful sunset. Compared with plain descriptive words like pretty, colorful, or beautiful, as the other options offer, this description does a much better job at resorting to description and sensorial effect.