Which One of the Following Statements Concerning Superconductors Is False $\varOmega$

Multiple Choice

Which one of the following statements concerning superconductors is false?

A) Below its critical temperature, the resistivity of a superconductor is zero $\varOmega$ -m.
B) Critical temperatures for some superconductors exceed 100 K.
C) All materials are superconducting at temperatures near absolute zero kelvin.
D) A constant current can be maintained in a superconducting ring for several years without an emf.
E) Superconductors are perfect conductors.