What are the characteristics of metals?

• A. Good conductors of electricity and heat', solid at room temperature; transparent shine brightly when polished.
• B. Good conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films; do not shine at all when polished.
• C. Bad conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films.
• D. Good conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films; shine brightly when polished.