When do associative and cooperative play tend to become most common in children?

The answer is "at the end of the preschool years".

Play is considered as an imperative impact of the learning procedure. There are different stages of play.
At the stage of associative play, youngsters will start to play together, yet not engaged towards a shared objective. A kid will be more inspired by playing with other youngsters around them than the individual toys they play with. And Cooperative play is the play where it is managed into gatherings and collaboration and it is seen. Kids are currently intrigued by both the general population that they are playing with and additionally the current movement.

B) hypothesis. its guessing and your guess could be changed quickly based on the information.