Lara ate \frac14 of a pie and Ryan ate \frac{3}{10} of the same pie. The next day Cassie ate \frac23 the pie that was left. What fraction of the original pie was not eaten?
Answer Choices
A. \frac{9}{10}
B. \frac{3}{10}
C. \frac{7}{60}
D. \frac{3}{20}
E. \frac{1}{20}