Mr. Roland is a stock picker. He tells you that he has an uncanny ability to pick stocks whose share prices will rise within the next year. This is despite the fact that he has been wrong 50% of the time in the past. What cognitive bias is Mr. Roland exhibiting?

a) Over-optimism.

b) Over-confidence.

c) Heuristical error.

d) Self-attribution bias.

e) Confirmation bias.

Note= Answer is not Over - optimism bias.