What is the main reason for processing coal ore? a) to increase heating value b) to remove inorganic material c) to eliminate pollution of groundwater d) to recover other valuable minerals from the ore

It is A because to increase heating value removing other materials from coal increases its effectiveness as an energy source, making the coal more valuable. It also reduces transportation costs.

u i forgot the answer?

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).