The LD50 of a fumigant with the signal word danger is?

The LD50, or lethal dose for 50% of the population, is a common measure of the acute toxicity of a substance, indicating the dose needed to produce death in half of a tested population. Fumigants with the signal word "danger" are categorized as highly toxic materials and typically have a very low LD50 value, reflecting their ability to cause harm at low exposure levels.

In this context, an LD50 value of 0-50 mg/kg signifies extreme toxicity, as it indicates that even small amounts of this fumigant can be lethal. This conforms to the classification where substances designated with the signal word "danger" are very toxic and can lead to severe health risks with minimal exposure.

The other options provided suggest LD50 values that are higher, which would imply lower toxicity and are generally associated with substances that are less hazardous. Thus, the designation of "danger" aligns closely with a very low LD50 range to indicate the serious risk they pose to health and safety.