James is talking about how much better the world would be if everyone simply agreed to "love one another" and "make peace, not war." in piaget's view, how old do you think james is? which stage? and why?

Out of the above given evidence, James is at the formal operational stage which consists of people of the the age 12 and above.

Explanation:

James is deductively reasoning, in the reasoning, the matters he addresses are social problems.Specifically, he addresses the social problem of conflict and reasons to reach a conclusion that if people loved one another, then there would be peace in the world.

Ithink b is the right answer