Answer:
The correct option is c) through struggle against entrenched interests.
Explanation:
Disadvantaged Americans have struggled a lot to get their rights. Most of these struggles were made to finish the entrenched interests. The disadvantaged Americans with time came to know that the public would not take any big steps to support them and they would have to fight for their rights. Even though some steps were taken by the federal government but they were not enough to bring the rights of the disadvantaged Americans. Hence, they had to fight through struggle against entrenched interests.