What is a liquid's flash point?

What is a liquid's flash point?
 
  A) Lowest temperature of a liquid, as determined by specific laboratory tests, at which the liquid gives off vapors at a sufficient rate to support a momentary flame across its surface
  B) Highest temperature of a liquid, as determined by specific laboratory tests, at which the liquid gives off vapors at a sufficient rate to support a flame across its surface
  C) Lowest temperature of a liquid, as determined by specific laboratory tests, at which the liquid reaches its boiling point
  D) Lowest temperature of a liquid, as determined by specific laboratory tests, at which the liquid gives off vapors at a sufficient rate that is too rich to support a combustion