The total amount of something remains the same.
Arnold is trying to understand the disagreement that occurs between Mr. and Mrs. Van Daan with regards the Mrs. Van Daan's fur coat. Which identifies the most useful question for Arnold to ask?
I looked around and I think the answer could be D. Exotic but human ???
A is the correct answer because the look of the needle is not as important as the other ones
One half - singular
Two halves - plural
