Select the best answer for the question. 12. What development accounted for the failure of the Schlieffen Plan?
A. Britain had superior land forces.
B. The Germans were poorly organized.
C. French and British forces launched an unexpected counterattack.
D, The Germans could not get past the British kenches.

C. French and British forces launched an unexpected counterattack.

Explanation:

According to historical scholars and accounts, some certain reasons are the development that accounted for the failure of the Schlieffen Plan, among which is the unrealistic strategy mapped out for the execution of the plan.

Also during the battle, the high resistance of the Belgium forces played a significant role in disrupting the plan.

Another reason is the "French and British forces launched an unexpected counterattack." This occurred at Marne around September 6 to 10, in 1914.

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the statement that best describes the idea of manifest destiny that was used in the 19th century would be that "it was fate that the united states would continue to  expand westward," since people thought the us was "destined" to do so.