What was the main concern was excluding slaves from the american revolutionary war effort

The major concern about the integration of slaves into the american revolutionary war was that the british forces could increase amazingly.

Explanation:

First of all, let's analyze the context and after that see why our answer is correct. In the American revolutionary war, the major belief was that if the revolutionary forces included slaves into their ranks. Thee English would also do that. And that was a considerable turning point to not do it. First of all, because the English didn't only have the thirteen colonies in America, but all over the world. So their power to gather slave forces would have been amazingly advantageous for them against the American revolutionary forces. And thinking about it, it still would represent a concern.

c: in the east might be the correct answer