AMC 10B 2009 Problem 2

Past Contests AMC 10 2009 Part B
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1

Which of the following is equal to

\dfrac{\dfrac{1}{3}-\dfrac{1}{4}}{\dfrac{1}{2}-\dfrac{1}{3}} ?

Answer Choices
A. \dfrac{1}{4}
B. \dfrac{1}{3}
C. \dfrac{1}{2}
D. \dfrac{2}{3}
E. \dfrac{3}{4}