A nail is pulled from a wall with a string tied to the nail. If the string is inclined at an angle of ${30}^{\circ }$ to the wall and the tension in the string is $50N$, the effective force used in pulling the nail is ____________

A. 25 N  
B. $25\sqrt{3}N$
C. 50 N
D. $50\sqrt{3}N$

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Correct Answer: A