According to the passage, an important limitation of relativity theory is that
A． it fails to describe space on a non-local level, complicating attempts to determine the geometrical model of the universe
B． it cannot account for the possibility that the universe may be multiply- connected instead of singly-connected
C． it yields inconsistencies in spatial topology equations, discriminating unnecessarily between the torus and the plane
D． it creates the illusion that observable space is curved, when in fact the universe may be Euclidean and planar
E． it does not provides sufficient variety in geometrical models to describe all the possible ways in which space may curve