It builds suspense and makes the reader curious.
1st is science fiction
2nd is fantasy fiction
3rd realistic fiction
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.
The introduction should introduce your main character, setting, location and time. it should also either introduce the main complication, start heading for the main complication or foreshadow the main complication.