Answer:
C) nonmetal
Step-by-step explanation:
Metals are a good conductor of electricity because in metallic bond the metal cations are surrounded by a free flowing network of electrons. These free electrons allow metals to conduct electricity. However, non-metals form covalent bonds by sharing electrons between them. So they do not have free flowing electrons to conduct electricity. Hence non-metals are poor conductors. Metals have a high metallic shine, they are ductile and malleable.
Non-metals on the other hand have no luster a powdery appearance.