For gasoline, the flash point (<50°C) is determined by the

Answer: Option A

The Abel apparatus is another commonly used instrument for determining the flash point of volatile liquids. It operates by gradually heating a sample of the liquid in a closed vessel and passing a small flame over the surface of the liquid at regular intervals. The flash point is the lowest temperature at which the vapors of the liquid ignite momentarily when exposed to the flame under specified test conditions.

Therefore, the correct option is Option A: Abel apparatus.