The options that highlight how the author makes the characters of Erkan and Michelle complex and believable are:
- The author uses dialogue to show Erkan's strong emotions and confusion, making him more relatable.
- The author describes Michelle's actions to show how she gains understanding and patience, making her more realistic.
These options suggest that the author employs techniques such as dialogue and character development through actions to deepen the complexity and relatability of both characters.
In contrast, the other options ("The author only focuses on Erkan's flaws" and "The author does not give any background information on Erkan") imply shortcomings in character development, which would make them appear less believable, rather than complex.