An ideal gas cannot be
a. heated
b. condensed
c. compressed
d. cooled

C compressed

Explanation:

An ideal gas cannot be compressed.

The compressibilty of a gas depends on the density of that gas.

Ideal gases have constant density and the densities are very low that the gas molecules don't interact much.

distance, luminosity, brightness, radius, chemical composition, and temperature

im doing test rn im going with 2 but ill give answer if itss wrong,   : )