Manish is the brother of Pradeep. Pradeep, whose daughter, Rita is Kavya’s mother. Sonu is Rita’s only brother. How is Sonu related to Manish?

Correct option is D

​$$\text{Given:} \\\text{1. Manish is the brother of Pradeep.} \\\text{2. Pradeep, whose daughter, Rita is Kavya’s mother.} \\\text{So, Rita is Pradeep’s daughter and Kavya’s mother.} \\\text{3. Sonu is Rita’s only brother.} \\\text{Thus, Sonu is Pradeep’s son.} \\\text{Since Manish is Pradeep’s brother, Sonu is Manish’s brother’s son.} \\\Rightarrow \text{Thus, Sonu is Manish's brother's son.} \\\text{Therefore, the correct answer is } \boxed{\text{Brother's son}}.$$​​