How is the answer not D? I count 4, through entailment, but the answer choice is 3?

Z has all three (because it has more than Y).

Y has only V and T (because it can't have equal or more than Z).

There's two.

X has R, but we don't know what else it might have.

W has either V or T or both.

Since S and Y do not have the same, it follows that S has R only.

There's three.

Now, what about U? U has to have two. But R can only go on three spots. Since R is on S, X, and Z, it follows that U has to have T and V.

There's four.

The answer choice is 3.

Now, somehow I'm misreading what the answer choice is asking, I assume. Can anyone help?