A circular spinner is divided into 12 identical unshaded sections and 3 identical shaded sections, as shown.
Each unshaded section is 3 times the size of each shaded section. An arrow is attached to the centre of the spinner. The arrow is spun once. What is the probability that the arrow stops in a shaded section?
Answer Choices
A. \frac{1}{15}
B. \frac{1}{5}
C. \frac{1}{12}
D. \frac{1}{13}
E. \frac{1}{4}