A spinner is divided into 3 equal sections, as shown. An arrow is attached to the centre of the spinner. The arrow is spun twice. What is the probability that the arrow lands on the same colour twice?
Answer Choices
A. \frac{1}{9}
B. \frac{2}{3}
C. \frac{1}{2}
D. \frac{1}{3}
E. \frac{2}{9}