I believe the answer might be D. Hope this helps!!! Sorry if it doesn't!
Answer: Oil, Dry grass or wood, alcohol.
Explanation:
The TROJAN WAR was basically waged against the City Of Troy, by the GREEKS on the TROJANS.
So the groups that participated in the Trojan war were the : GREEKS and the TROJANS. It began when the wife of the King, Helen Of Troy, was taken.
