The excerpt that best supports the inference that the future of the colonies depended on the events of that night in April 1775 is C. The line "The fate of a nation was riding that night" suggests that the events of that night were crucial to the future of the nation. This line implies that the outcome of the events on that night would have a significant impact on the course of history for the colonies, and perhaps even determine their fate as a nation.
~~~Harsha~~~