Answer:
Britain was concerned about France defeated by Germany because of their thought they also may also be attacked by the Germans.
Explanation:
While there were no real tensions and issues between Britain and Germany till the mid 19th century, things began to change with the coming to power of Kaiser Wilhelm who dismissed Otto von Bismark in 1890. And he began to work aggressively towards increasing Germany's influence in the world. When German Foreign Minister Bernhard von Bulow called for a policy to assert Germany's claim to be a global power, that will in increase to challenge and upset international order, Britain began to see Germany as a threat. Thus, if France gets defeated by Germany, there is also a chance that Britain will also get attacked.
