Add question tag
1)they will wait for it , ?
2)Read the book,?
..

The second answer is correct (B).

Friendship during childhood is important to the child in many ways, including the development of loyalty, companionship, and other positive aspects that positive social relationships attract.

However, friends are not the first chance for a child to learn to be social with his brother. This question involves the teaching of parents. It is parents who are responsible for cultivating closeness among siblings.