Concept:Boiling point depends on external pressure: higher pressure raises the boiling point of a liquid.Explanation:A place 30 m below sea level has greater atmospheric pressure than at sea level because of the weight of the extra air above it.Pure water boils when its vapour pressure equals the external pressure.Since external pressure is higher, the water must reach a higher temperature before it can boil.Therefore, the boiling point will be more than 100∘C.Answer:A. It will be more than 100∘C