Explanation: Broaden and build theory describes about the happiness and joy is responsible for extending one's interaction and awareness to think, improving creativeness, enhance actions etc. It determines and encourages about the positive and happy emotion.
The observation mentioned in the question is indicating about the broaden and build theory of positive emotions. It is describing the happiness as the source of open thinking, looking positively on those events that were overlooked before etc.
The answer is D. Chemical energy is the that is stored and energy is stored in the girls muscles. Mechanical energy is energy in motion and the box is moving off the floor
