What Is the Difference Between an Ore and a Rock

Multiple Choice

What is the difference between an ore and a rock?

A) ores contain a large concentration of a particular mineral; a rock may or may not be an ore
B) ores contain only metallic minerals; rocks contain only nonmetallic minerals
C) ores are always profitable to extract; rocks are never profitable to extract
D) ores are good conductors of heat and electricity; rocks are not good conductors of heat and electricity
E) ores are usually formed through hydrothermal processes; rocks are usually formed through sedimentation