Which is the correct answer ?
A teacher is checking on his student.
Teacher: How are you doing?
Student: I've almost done. But ( ) . ー (A) I'm not sure what to think. (B) I don't know how this goes.
(C) I don't see things. (D) I can't figure this out.
Teacher: Where are you having trouble?
Student: I know how to start, but halfway through I get stuck.
・I think (D) is correct.