Lakshmi and Meena's are Rohan's wives. Shalini is Meena's step-daughter.
How is Lakshmi related to Shalini ?
Answer: C. Mother
Shalini is Meena's step-daughter means Shalini is the daughter of the other wife of Rohan.
So, Shalini is the daughter of Lakshmi or Lakshmi is the mother of Shalini.