Final answer:
The air parcel's free rise is within the troposphere, the lowest atmospheric layer where weather occurs and air temperature decreases with altitude.
Step-by-step explanation:
The level at which an air parcel will be able to rise freely is called the troposphere. This is the lowest layer of Earth's atmosphere, extending from the surface up to an altitude of about 11-15 km (7-9 miles in the polar regions to about 17-18 miles in the tropics). The temperature in the troposphere decreases with increasing altitude, reaching its lowest at the tropopause, which is the boundary layer between the troposphere and the stratosphere.
Most of the Earth's weather phenomena, including the formation of clouds and precipitation, occur within the troposphere due to its considerable water vapor content and the process of convection. The greenhouse effect also takes place primarily within this layer. Beyond the troposphere, in the stratosphere and above, the air is generally too stable and dry to support rising air parcels and the kind of weather we experience at Earth's surface.