Answer: d. colors = {"red", "orange", "yellow", "green", "blue", "indigo", "violet"}
Step-by-step explanation:
We use "{}" to write a set in it.
Also, the names of the colors are strings so we use inverted commas ("") to express them.
So, the set named colors that contains the 7 colors in a rainbow will be:
colors = {"red", "orange", "yellow", "green", "blue", "indigo", "violet"}
Hence, the correct option is d.