Answer:
The correct answer and why the American Revolution could be considered a world war is B) Many nations had entered the struggle.
Step-by-step explanation:
While the American Revolution is addressed as a war of independence between the American colonies and the British Crown, it was arguably just one front of a broader, world war between imperial powers.
At the time of the American Revolution, other European powers were trying to restrain the power of the British Crown. France and Spain joined the American side providing arms and troops. The Dutch Republic also traded goods and weapons to the American side. These European parties had their own interests invested in the war against the British.