Japanese: In my class the teacher made example sentences. I have a question about it. The sentence is ケンさんは何がとくいですか。What is type of particle is が in this sentence?

Which of the following sentences from the text contains an example of metaphor he look like one of those ballerinas that dance just on the tips of your toes be mom was horrible snake-woman boys came out again and said if you ever ever see brian's hand was shaking and he was crying like a big baby but his fingers still stayed out the right when the fire was going to give him a good roasting joetta ran across the room and sounding like the little engine that thought it could she blew the match out before it got him