Which sentence contains a metaphor?

Question

Milo was as fast as a cheetah when he ran the race at school.
I was so hungry that I could have eaten ten thousand hamburgers.
The sunset was a masterpiece of brilliant oranges, pinks, and purples.
Connie walked her dog along the tree-lined street.

Answer 1

The sunset was a masterpiece of brilliant oranges, pinks, and purples.