For a Given Substance That Exhibits Liquid- Crystalline Properties, the Transition

For a given substance that exhibits liquid- crystalline properties, the transition from solid to liquid- crystal state occurs .

A) over a range of temperatures between the melting point of the solid and the boiling point of the liquid
B) at a well defined temperature above the melting point of the solid
C) at a well defined temperature below the melting point of the solid
D) at the melting point of the solid
E) over a range of temperatures that includes the melting point of the solid