|A) Grandmother and Grandson||B) Mother and Son|
|C) Aunt and Nephew||D) None of these|
Clearly, the brother of woman's mother is the same as the brother of the father of boy's maternal uncle. So, the woman's mother's brother is the boy's maternal uncle's father. Thus the woman's mother's brother's son is boy's maternal uncle, i.e woman's mother's brother's daughter is boy's mother.