J.R. S. answered 08/07/19
Ph.D. University Professor with 10+ years Tutoring Experience
The most likely answer would be B. Metallic, since metals are the best conductors. Metalloids can conduct at higher temperatures (semiconductors), so that could be an answer, but not the best. Gases and non-metallic ions in general, do not conduct electricity (ionic compounds and graphite would be exceptions).