Final answer:
The leaders of the Protestant Reformation, The Enlightenment, and the Scientific Revolution were united by their opposition to traditional authority and dogma, advocating for reason and critical thinking, and pushing for societal change.
Step-by-step explanation:
The leaders of the Protestant Reformation, The Enlightenment, and the Scientific Revolution all shared several commonalities in their approaches to thinking and action. One of the core similarities was their b) Opposition to traditional authority and dogma. These movements were characterized by a marked shift towards questioning established authorities and beliefs, be they religious, philosophical, or scientific. Additionally, leaders and thinkers within these movements often advocated for reason, logic, and critical thinking, and took significant steps toward promoting individual rights and freedoms. They were united by a strong desire to challenge the status quo and bring about change, with each of these movements contributing to the development of modern societies as we know them.