Opals come in a variety of colors, and they range from opaque to transparent. The most desirable opals are known as the precious opal. They have a special iridescent quality as you move, opal under light, and it shows a spectrum of colors.
Which words Provide the *best* clues remaining of iridescent?
“Variety, light, spectrum of colors”
B. “Opaque, quality, desirable”
C. “Transparent, variety, opals”
D. “Opals, special, precious”
*I think it’s a *