Answer:
C). They show character growth.
Explanation:
The authors employ a variety of characters to unfold the plot in the desired manner and comprehend readers' understanding that would assist them to associate themselves to the content and elicit intended response.
A complex character is one of these characters whose primary traits that it undergoes a significant change throughout the course of the narrative. These characters possess a number of traits that reflects the different aspects(complexity) of their character. However, this variety often leads them into unexpected situations that evokes hostile/undesired actions but it is due to this they end with a transformational change that reflects growth in their character towards the end. Thus, option C is the correct answer.