Answer:
C. a mountain peak
Step-by-step explanation:
Boiling occurs when vapour pressure equals atmospheric pressure. The vapour pressure is the pressure used by the gas leaving the pot and those returning. For boiling to occur, the vapour pressure must pass the atmospheric pressure around. At sea level, the atmospheric pressure is very high. With altitude, the air becomes thinner and atmospheric pressure becomes lower. With increasing altitude, the low atmospheric pressure makes the boiling point lower as a result of the decreasing pressure on the vapour. The boiling point can then easily be reached at higher altitudes. Therefore, a mountain peak has atmospheric conditions that produce the lowest boiling point for water as it has a higher altitude.