In accordance with Coast Guard Regulations (46 CFR), which of the following power sources would be acceptable for the carbon dioxide warning alarm?

Correct Answer: Option D — The alarm shall depend on no source of power other than the carbon dioxide.

To ensure reliability during a total power failure, the CO2 warning alarm must be independent of the ship's electrical distribution. 46 CFR requires the alarm to be powered solely by the discharge of the carbon dioxide itself, guaranteeing that personnel are alerted immediately when the gas is released.