10 points english question which best identifies a metaphor? a. he screams as loud as he is able- b. look at him, now the fourth's day come! c. he scarcely weighs a sugar-plum; d. he's like a little bit of thread,

Hey there!
We know that a metaphor is a form of figurative language. Its purpose is to compare two things without using the words "like" or "as", because that would make it a simile.
That allows us to rule out A and D.
Since you asked for which best identifies as the best metaphor, I'm going to go with C. It provides a better and more clear comparison as opposed to B.
Hopefully this helps!