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The explosive range of a substance indicates the concentration limits within which it can form a combustible mixture with air. For acetone, the correct explosive range is recognized as 2.6% to 12.8%. This means that when acetone is present in this concentration range, it has the potential to ignite and cause an explosion when mixed with air.

Understanding the explosive range is critical for safety in environments where acetone is used, as it helps to establish safe handling practices and informs personnel on the risks associated with increased concentrations of the vapor in the air.

The other options do not accurately reflect the established explosive range for acetone, which emphasizes the importance of using precise data when assessing the hazards associated with flammable materials.