A Certain Material Has a Resistivity of 7 $\Omega$ M at Room Temperature, and Its Resistivity Increases as the .M

A certain material has a resistivity of 7.8 *10³ $\Omega$ .m at room temperature, and its resistivity increases as the temperature is raised by 100 ° C.The material is most likely:

A) a metal
B) a pure semiconductor
C) a heavily doped semiconductor
D) an insulator
E) none of the above