The answer is A. The second one is two clauses that only need a comma for separation. The third had what needs a comma afterwards in parentheses. The last one does not even have two, which automatically makes it incorrect, as well as the information being necessary for the context of the sentence.
The correct answer is: self-serving bias.
A person who shows a self-serving bias is one who wishes to maintain their good opinion of themselves, even boost their self-esteem, by interpreting situations in a biased manner. In a successful situation, they try to take all the glory for themselves while, in the case of failure, they refuse to take any portion of the blame or responsibility.
Answer:
The opposite of losing is to win
