Use the excerpt to answer the question.
Opals come in a variety of colors, and they range from opaque to transparent. The most desirable opals are known as the precious opals. They have a special iridescent quality. As you move the opal under light, it shows a spectrum of colors.
Which words provide the best context clues for the meaning of iridescent?
(1 point)
"variety, light, spectrum of colors"
"transparent, variety, opals"
"opaque, quality, desirable"
"opals, special, precious"