Which of the following are true regarding ores?
I. Ores can be metallic.
II. Ores can be nonmetallic.
III. Ores consist of minerals.
IV. Materials removed from ores are useful.
A. I, II, III, and IV
ОВ.
II, III, and IV only
C. I, III, and IV only
D. I, II, and Ill only