Four Different Main-Sequence Stars Are Colored Blue, Orange, Red, and Yellow

Multiple Choice

Four different main-sequence stars are colored blue, orange, red, and yellow. What is their rank from coolest to hottest?

A) blue, yellow, orange, red
B) blue, orange, red, yellow
C) orange, blue, yellow, red
D) red, orange, yellow, blue
E) red, yellow, orange, blue