Explanation: This stage is approximately between seven and ten years old. During the concrete operational stage, the child achieves the use of completely logical operations for the first time. Thought is no longer dominated by perceptions and the child is able to solve problems that exist or have existed (are concrete) in his experience. Thought becomes less egocentric. Now the child is able to build knowledge that is more compatible with the world around him. The real and the imaginary no longer mix in their perception. Thought becomes operative because it becomes reversible, that is, the subject can mentally return to the starting point.
A is definitly wrong because i just took it and this happen: I think th eanswer is d. purchasing manufacturaing equipment! please tell me if this is right. Hope i helped!
