Final answer:
Ratan calls the postmaster 'Dada' because he serves a father-like role in her life, reflecting the emotional closeness and warmth of their relationship in a culture that values familial bonds.
Step-by-step explanation:
The student is asking about the character Ratan from a literature piece calling the postmaster "Dada". In this context, "Dada" is a term that denotes brotherly affection and respect and is often used in Indian culture to address someone who is not a biological brother but is close enough to be considered family. The most likely reason Ratan calls the postmaster "Dada" is C. The postmaster serves a father-like role in her life. This is evident in cultures where there's a significant value placed on familial bonds and roles; younger individuals might refer to older ones who take care of them or show them kindness as "Dada", reflecting the emotional closeness and warmth of their relationship. Hence, the postmaster's fatherly care and affection toward Ratan would make her look up to him as a father figure, which explains her use of the term "Dada" when addressing him.