What does the label 'Caution Flammable' indicate about a pesticide's flashpoint?

• A. It has a flashpoint above 100°C.
• B. It has a flashpoint below -50°C.
• C. It has a flashpoint around 0°C.
• D. It has a flashpoint between -7°C and +10°C.

Answer: (D)

Flashpoint is the temperature at which a pesticide’s vapors can ignite in the presence of an ignition source. A label reading “Caution Flammable” signals a relatively low flashpoint: the product can form ignitable vapors at modest temperatures, so it must be handled with care around heat, sparks, or flames.

Among the given options, a flashpoint somewhere around freezing is the best fit, which is captured by a range like -7°C to +10°C. If the flashpoint were much higher (above 100°C), it wouldn’t be considered flammable under this labeling. If it were extremely low (below -50°C), that would imply an even more hazardous profile than what “Caution Flammable” typically conveys. A single point around 0°C is plausible, but the label’s meaning is best represented by a low-but-not-extremely-low range, hence the -7°C to +10°C window.