Which scene in the Bayeux Tapestry illustrates a rare occurrence?

a. a feast with King WilliamB. a blessing by Bishop OdoC. servants preparing a mealD. an appearance by Halley's Comet?

The scene in Bayeux Tapestry that illustrates rare occurrence is: D. an appearance by Halley's Comet

In writing, rare occurrence refers to the event that the characters do not normally see in their everyday life.

Halley's Comet only appears once every 75 years, so i think this could be considered as a rare occurrence.