False chicory's taproot is always one half as long as the plant is tall. Furthermore, the more rain false chicory receives, the taller it tends to grow. In fact, false chicory plants that receive greater than twice the average rainfall of the species' usual habitat always reach above-average heights for false chicory.

Question: If the statements above are true, then which one of the following must also be true?
Options:
A. If two false chicory plants differ in height, then it is likely that the one with the shorter taproot has received less than twice the average rainfall of the species' usual habitat.
B. If a false chicory plant has a longer-than-average taproot, then it is likely to have received more than twice the average rainfall of the species' usual habitat.
C. It is not possible for a false chicory plant to receive only the average amount of rainfall of the species' usual habitat and be of above-average height.
D. If the plants in one group of false chicory are not taller than those in another group of false chicory, then the two groups must have received the same amount of rainfall.
E. If a false chicory plant receives greater than twice the average rainfall of the species' usual habitat, then it will have a longer taproot than that of an average-sized false chicory plant.
Answer: "E"