Joshua is capable of empathy towards people he doesn't know. Socially, he tends to group with other boys, and he is increasingly concerned with making and keeping friends. Joshua is most likely in which stage of childhood?

I believe the answer is: elementary school

during this stage, children started to understand the process of social interraction and start to make efforts to obtain friends. But, since they are still gullible, they tend to generally like and trust all people. They haven't understand the concept of betrayal and how they should only trust the person who had proof their loyalty as a friend.