Answer: (C) Self-serving bias
Step-by-step explanation:
The self serving bias is one of the type of cognitive process in which it enhanced the self esteem and also it refers to the people tendency for attribute in the different types of positive events by using the external factors.
According to the given question, the Susan is usually used for writing the assignments and her explanations describe about the self serving bias.
The self serving bias is one of the concept that explain about both the external and the internal situational forces in the environment.
Therefore, Option (C) is correct.