The answer is "stacks." That is the object of the phrase, and since a person is searching for something ON the shelf, they aren't searching for the shelf itself.
[He has estimated that the problem would lead to a loss of $10,000 and would require time to resolve.]
This should be the right answer hope it helps!!
Answer: are
Explanation: I'm just right
D and B counter point and the other two are point. I might be wrong wait till a second person anwsers
