The correct answer to this open question is the following.
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When Julie asked her son why his team lost their last baseball game he blamed it on the way the sun was shining on the field. He claimed that every time someone hit a fly ball they could not be caught because the sun was in the players' eyes. This is an example of a self-serving bias.
It is a self-serving bias because in this case, an individual takes the credit for positive results when things go well. However, when things go bad, he is not the one to blame. He blames others.
That is why Julie's son is doing, blaming external factors to explain why the team lost in the baseball game, instead of accepting the responsibility of the team in the defeat.