Introduction:
In this question, we are asked to identify who usually writes the letters. The correct answer is option 'B', which states that the child usually writes the letters. Let's explore why this is the correct answer.

Explanation:
1. Children and Letter Writing:
Children are often encouraged to write letters as a way of developing their communication skills, creativity, and expressing their thoughts and feelings. Letter writing is a valuable activity that helps children learn how to structure their thoughts, use language effectively, and connect with others.

2. Parents' Role:
While parents may assist younger children in writing letters, the actual content and message of the letter are often generated by the child. Parents might provide guidance, help with spelling, or offer suggestions, but the child is the primary author of the letter.

3. Importance of Child's Involvement:
Encouraging children to write letters allows them to develop their own voice, express their emotions, and build connections with others. It also promotes independence and confidence in their own abilities.

4. Friends and Letter Writing:
Although friends can be recipients of letters, they are not typically the ones who write the letters. Friends can exchange letters as a means of staying in touch, sharing experiences, or expressing their friendship, but the act of writing the letter is usually done by the individual.

5. The Role of Postman:
The postman's role is to deliver the letters from the sender to the recipient. They are not involved in the actual writing process of the letters.

Conclusion:
In summary, while parents may assist younger children in writing letters, it is the child who usually writes the letters. This activity allows children to develop their communication skills, express their thoughts and feelings, and build connections with others. Friends can receive letters, but they are not typically the ones who write them. The postman's role is to deliver the letters, not to write them.

The child decides to write letters to get a reply from her friends.