A ladder 5cm long long rest against a wall such that its foot makes an angle 30^o with the horizontal. How far is the foot of the ladder from the wall?

A. \(\frac{5\sqrt{2}}{3}m\)
B. \(2\frac{1}{2}m\)  
C. \(\frac{5\sqrt{3}}{2}m\)
D. \(\frac{10\sqrt{3}}{3}m\)
E. \(10\sqrt{3}m\)

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Correct Answer: B