In a City High in the Mountains, Such as Denver

In a city high in the mountains, such as Denver, CO, water boils

A) at the same temperature as it does at sea level.
B) at a higher temperature than it does at sea level.
C) at a lower temperature than it does at sea level.
D) at a higher temperature than it does at sea level in the morning but at a lower temperature than it does at sea level the rest of the day.
E) at a lower temperature than it does at sea level in the morning but at a higher temperature than it does at sea level the rest of the day.