Antares is a supergiant with a temperature of 3,500 k. antares is most likely in color.

Firstly, let's define the following:

The color temperature of a light source is defined by comparing its color within the light spectrum with that of light that would emit a black body heated to a certain temperature.

In this sense, the Wien's law, relates the wavelength   where the intensity of the radiation is maximum (also called peak wavelength) with the temperature of the black body.

In other words:

There is an inverse relationship between the wavelength at which the emission peak of a blackbody occurs and its temperature.

Being this expresed as:

   (1)

Where:  

is the temperature in Kelvin (K)

is the wavelength of the emission peak in meters (m).

is the Wien constant, whose value is

Then:

   (2)

   This wavelength corresponds to red color.

Therefore:

d. air pressure decreases as altitude increases.

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