Given in the question,
V and W are together on a shelf.
Four objects are on the middle shelf.
At least two objects must be on the top shelf.
T and U must be on different shelves.
V is either on one shelf or two shelves above X.
W is either on one shelf or two shelves above X.
As V and W are on the same shelf, and since they are on a shelf together, it must not be the middle shelf
Since there are four objects on the middle shelf, the remaining objects must be on the middle and the top and bottom shelves.
V and W are placed either one or two shelves above X, and they are together, X must be on a lower shelf than them
For Option A:
As there are four objects placed on the middle shelf and two on another shelf (V and W), Y could likely be on the top shelf to fulfill the requirement of having at least two objects
For Option B:
Since U and T must be on different shelves, and there are only three possible shelves, U could be on the bottom shelf. This is a possibility, but not confirmed
For Option C:
This is likely because U and T must be on different shelves, and if U is on the bottom shelf, T would be on the middle shelf.
For Option D:
Z could be on the middle shelf to make up the four objects on that shelf, but it's not necessarily guaranteed. It’s a possibility
The correct option is (C): Y is on the top shelf.