Who volunteered to teach Koly?

The correct answer is that Sassur volunteered to teach Koly. In “Homeless Bird,” Sassur is a key figure in Koly's life, representing a supportive influence and an important source of knowledge. He understands Koly's situation and sees potential in her, which prompts him to offer his teaching. This act is significant for Koly as it not only provides her with an education but also helps her to develop her identity and skills in a time of uncertainty.

Koly's mother and the other potential choices do not play the same role in facilitating her education. Koly's relationship with her mother is more complex and doesn't center around teaching or formal education. A neighbor might show kindness or support but lacks the commitment and structured approach that Sassur offers. Therefore, Sassur stands out as the character who consciously decides to take on the role of a mentor, which is vital for Koly's growth and empowerment in the story.