Answer:
E. a conflict between Accline Cars and its dealers.
Explanation:
As for the information provided,
We know a vertical conflict refers to a kind of conflict between two different people in the same channel of sales, in which they are not on the same level.
The conflict between Accline cars and its dealers is a conflict in the same chain, in between two different people, and at two different positions.
This clearly demonstrates that the conflict is in between the supplier and the dealer, within the same chain representing a vertical chain.