The statement that best compares the effects of absolute monarchy and constitutional monarchy is:
An absolute monarchy is overly dependent on a single monarch, which can lead to a system that is overthrown, while a constitutional monarchy can bring long-term stability.
This statement accurately reflects the fundamental differences between the two systems: absolute monarchies rely on the power and decisions of one individual, making them vulnerable to instability and revolution if that individual is ineffective or unpopular. In contrast, constitutional monarchies are typically governed by laws and a constitution that distribute power more evenly and can provide a more stable political structure.