Candice has been playing the violin for 25 years. She has an advanced degree in music performance and plays for the local symphony as first chair. Candice's sister, Jessica just started playing the piano about a year ago. Jessica is now able to play many songs by sight reading music. When asked to rate their musical ability relative to the best musicians in the world, Candice said 7/10 and Jessica said 8/10. This inconsistency is an example of:
a. the Dunning-Kruger effect
b. the heuristic effect
c. negative bias
d. confirmation bias