Read these lines of poetry:

The wicked dragon breathed fire,
and its wings were black as coal.
But the knight's eyes were diamonds,
and he kept his self-control.

Which line contains a metaphor?

A.
"and its wings were black as coal."

B.
"The wicked dragon breathed fire,"

C.
"and he kept his self-control."

D.
"But the knight's eyes were diamonds,"

(i have that question and this bonus question: What's the right subject to pick for poems, because ihave just been picking English, but im asking cause i dont want to get my question removed because its the wrong subject, thanks)