Answer:
A. A war fought on two different geographic fronts.
Step-by-step explanation:
A two-front war can be defined as a war fought on two different geographic fronts.
Generally, this type of war is usually executed simultaneously by two or more independent forces with the hope or intentions of having the opposing force (opponent or enemy) split its armies to fight and quell the threats at the different geographic fronts. Thus, more often than not it limits the possibility of the opposing team winning the war as they are confronted with battles at different geographical locations.
For example, Nazi Germany fighting against the Soviet Union to the east and other Western Allies on the west.