The answer to the first is B. Appositive position, because it is separated with commas. The answer to the second is C. predicate position, because Frustrating is a participle that combines with is to create a predicate.
A snuffbox was something common and very bad as far as habits go. Consider it like smoking in a nice brand new car.
B. it is b. b is the answer
the answer is D, comforting
