The correct option is A Uncle
The given data can be rearranged as:
Mr. and Mrs. Dhingra family: Sushma, Ramesh and Mahesh
Mr. and Mrs. Gupta family: Seema, Rohit and Shriram
Mr. Khanna family: Harini and Pallavi
Shriram Gupta and Sushma family: Kiran and Amar
Mahesh Dhingra and Harini family: Samant, Rohini and Suman
Clearly, Ramesh is brother of Sushma whose son is Kiran.
Hence, Ramesh is the uncle of Kiran.