According to Most Developmentalists, What Is the Effect of Interactions

According to most developmentalists, what is the effect of interactions between children of different ages?

A) It is detrimental because of the asymmetry of status, particularly for the younger child.
B) It is stressful for most children and therefore avoided.
C) It increases prosocial and leadership skills in older children and helps younger ones to learn when to seek assistance.
D) It adds little because the experiences are redundant with sibling interactions.