Answer:
A.
Step-by-step explanation:
A is correct because if they both want the same resources, they're going to enter conflict because they both want them.
B is wrong because they have no need to argue if they both have the same amount of influence and power.
C is wrong because they are able to accomplish their own goals without the other group, so there's no need to argue.
D is wrong because they won't argue if they have every necessity because there is no need.