Correct option is A
Garv is married to Devi → couple 1.
Hari is the father of Manu, and Garv and Manu are siblings => Hari is married to Sashi (since Garv is the son of Sashi and Hari is father of Manu) → couple 2.
Prem is the brother of Devi and the father of Karan; Prem has no daughters, but no spouse is mentioned, so no confirmed couple.
Janvi is the daughter of Manu; Manu’s spouse is not mentioned, so no confirmed couple.
Only two married pairs can be definitely identified.