A \( \frac{1}{3} \mathrm{~m} \)
B \( \frac{1}{2} \mathrm{~m} \)
C \( \frac{2}{3} \mathrm{~m} \)
D \( \frac{3}{4} \mathrm{~m} \)
E \( \frac{1}{4} \mathrm{~m} \)
Correct Answer: Option A
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