The option that best reflects how we can still detect the effect of British imperialism around the world is:
The British built schools and infrastructure (railroads, bridges, etc.) in their colonies. They also spread the use of the English language.
This option highlights the lasting impacts of British colonial policies, as many former colonies still retain elements like English as a primary or secondary language, as well as infrastructure established during the colonial period. The legacy of educational systems and the cultural influences that emerged from British imperialism can still be observed today. The other options, while related to British imperialism, do not have the same broad and enduring implications.