Harold made a plum pie to take on a picnic. He was able to eat only \dfrac{1}{4} of the pie, and he left the rest for his friends. A moose came by and ate \dfrac{1}{3} of what Harold left behind. After that, a porcupine ate \dfrac{1}{3} of what the moose left behind. How much of the original pie still remained after the porcupine left?
Answer Choices
A. \dfrac{1}{12}
B. \dfrac{1}{6}
C. \dfrac{1}{4}
D. \dfrac{1}{3}
E. \dfrac{5}{12}