Nah, I am right. The bottle of oil can be any size in which it is smaller than the bottle of tea. All conditions where this is true satisfies the answer.
If the bottle of tea is bigger than a bottle of oil then the bottle of oil can be
1) smaller than the bottle of milk and smaller than the bottle of juice, (Oil<Milk<Juice<Tea<Water)
2)larger than than the bottle of milk but smaller than the bottle of juiceJ, (Milk<Oil<Juice<Tea<Water), or,
3) larger than the bottle of juice but smaller than the bottle of tea (Milk<Juice<Oil<Tea<Water)
All three conditions above satisfy the answer because all three answers have the bottle of oil smaller than the bottle of tea. There is no other information given as to the relative size of the bottle of oil. Since the question does not ask to choose only 1 answer, the logical choice is all conditions that satisfy the predicated condition.