Final answer:
The boiling point of water decreases when moving to a higher altitude of 1500 meters because atmospheric pressure is lower, requiring less heat for the liquid to reach its boiling point. Thus, the correct answer is option b.
Step-by-step explanation:
When water is moved to a point 1500 meters higher than the starting point, the boiling point will decrease. This is because atmospheric pressure is lower at higher altitudes, which reduces the amount of pressure exerted on the liquid's surface and allows it to boil at a lower temperature. As per a concept known as vapor pressure curves, if one were to draw a horizontal line at a lower vapor pressure, it would intersect the curve at a lower temperature. At sea level, for instance, water boils at 100°C, but in Denver, Colorado, which is at an altitude of approximately 1600 meters, the atmospheric pressure drops to about 640 mm Hg, causing water to boil at roughly 95°C.