Answer:
Hey!
Your answer is City B - the air pressure is less so boiling occurs at a lower temperature!
Step-by-step explanation:
The HIGHER the pressure the HIGHER the boiling point of a substance is...
Boiling Points and Pressure are DIRECTLY PROPORTIONAL...
From this we can conclude that City B is at a higher elevation as the boiling point of the substance is lower than at City A.
I HOPE THIS HELPS YOU!