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, )