Researchers attempt to understand personality using biological, psychological, and social-cultural levels of analysis. the psychological level of analysis is especially likely to emphasize the importance of:

The answer to this question is attributional style.
attributional style refers to the process of attributing certain  negative or positive events with our psychological condition.
People who tend to exposed to constant negative events tend to develop a harsher personalities than people who don't.

Bob: coke is baby pandas.jim: what? how do you figure that coke is baby pandas? bob: because this book says so.jim: how do we know the book is correct? bob: because it says that coke is baby pandas.jim: how does that prove the book's accuracy? bob: because it's statement involving coke and baby pandas is correct, therefore it is accurate.jim: how do we know that it's correct? bob: because we have concluded that the book is accurate, and therefore the statement is correct.therefore, coke is baby pandas.