Final answer:
Statements A, B, and C provide evidence of the conservation of energy in the scenario, reflecting the principle that energy is neither created nor destroyed, only transferred or transformed.
Step-by-step explanation:
Based on the conservation of energy in physics, three statements that provide evidence in the scenario are:
- A. The total mechanical energy of the system remains constant.
- B. The work done by external forces is equal to the change in mechanical energy.
- C. The system's kinetic energy decreases as potential energy increases.
These statements are reflective of the Law of Conservation of Mechanical Energy and related conservation laws, which state that energy can neither be created nor destroyed, only transferred or transformed. Statement D is incorrect because it contradicts the fundamental principle that in a closed system, energy is conserved and not created or destroyed.