Final answer:
The meaning of 'Bonkoro' as used in Roemer's story cannot be determined from the provided excerpts, and further analysis of the source material is necessary to understand its proper definition.
Step-by-step explanation:
In Roemer's "The Inheritance of my Father: A Story for Listening," when the grandmother refers to the girl as "Bonkoro," it is not explicitly defined within the provided excerpts. The meaning of "Bonkoro" needs to be inferred from the context or explained by the source material, which does not seem to be included in the given information. Therefore, based on the limited information presented, it is not possible to accurately define "Bonkoro" as any of the provided options. To understand the term properly, one would have to refer to the source material where the term is used for its exact definition.