The postmaster was an amiable man.

Explanation:
The word "amiable" means friendly and pleasant in nature. In the context of the postmaster, it suggests that he was a person who was easy to get along with and had a pleasant demeanor. Let's explore why the correct answer is option 'C' - amiable.

The story of the postmaster revolves around a young man who is posted to a remote village as a postmaster. Initially, he feels lonely and isolated in the village. However, as time passes, he develops a bond with Ratan, a young girl who works as a domestic help in the post office.

1. The postmaster's behavior towards Ratan:
Throughout the story, the postmaster is shown to be kind and compassionate towards Ratan. He teaches her how to read and write, and their interactions are filled with warmth and affection. He becomes a fatherly figure to her, which indicates his amiable nature.

2. The postmaster's interactions with other villagers:
The postmaster is also shown to be friendly and approachable with other villagers. He engages in conversations with them, listens to their stories, and tries to understand their lives. This shows that he is an amiable man who is genuinely interested in the people around him.

3. The postmaster's sense of humor:
The postmaster is portrayed as someone with a good sense of humor. He often jokes and laughs with Ratan, making their time together enjoyable. This further reinforces the idea that he is an amiable person who knows how to create a pleasant atmosphere.

4. The postmaster's willingness to help:
When the postmaster falls sick and longs to go back to his hometown, he confides in Ratan. Despite his own struggles, he shows concern for her well-being and encourages her to pursue her dreams. This selflessness and empathy highlight his amiable nature.

In conclusion, the postmaster is depicted as an amiable man throughout the story. His kind and friendly demeanor, his interactions with Ratan and other villagers, his sense of humor, and his willingness to help others all contribute to his characterization as an amiable person.