Manny coaches a team of 10-year-old boys in baseball. When they lost to their archrivals by a score of 7-2, the boys complained that the umpire was not fair and that they would have won if they had played on their home field.
This is an example of ____.

a) ​correspondence bias
b) ​group-serving bias
c) ​just-world belief
d) ​self-serving bias