Final answer:
The main limitation of a Supreme Court-focused strategy in advancing civil rights is that Supreme Court decisions require implementation by other branches of government, as these decisions are not self-enforcing. (option c)
Step-by-step explanation:
The limitation of a Supreme Court-focused strategy to the advancement of civil rights is that Supreme Court decisions are not self-enforcing, meaning the Court must rely on other entities to execute its decisions. This limitation is encapsulated in option (c) of the provided question. The Court cannot initiate its own cases; it only reviews them from lower courts. Once a decision is made, it is incumbent upon the executive and legislative branches to ensure that the ruling is implemented and followed through. Therefore, the Court's influence on civil rights is significant but depends on the cooperation of other governmental branches for the enforcement of its rulings.