Final answer:
Britain and Spain reacted to the French Revolution by forming alliances to suppress revolutionary movements rather than supporting them. Their involvement, particularly in regions like Haiti, was aimed at protecting their own interests by weakening France and preventing the spread of revolutionary ideas.
Step-by-step explanation:
Foreign powers such as Britain and Spain reacted to the French Revolution by forming opposition to the revolutionary movements and at times actively intervening. Britain and Spain were among the European nations that went to war with France following the revolution, primarily because they did not want the revolutionary sentiment to undermine their own monarchical states. Instead of supporting the revolutionary ideals, Britain and Spain landed troops in places like Haiti to support the White colonists and suppress the slave rebellion, with the intent to weaken France economically and prevent the spread of revolutionary ideas to their own colonies.
Moreover, the reaction of these countries reflected a broader European fear of the spread of revolutionary changes, which might threaten the existing social and political order. Thereby, in the context of the student's question, the correct option is B. They formed alliances to suppress the revolutionary movements. Europe's monarchies were keen to contain the revolution and preserve the traditional system of monarchy, which was directly challenged by France's upheaval.