Warning signs are sometimes placed on aerosol cans to prevent people from throwing them into a fire. What would be true about the contents of the gas in an aerosol can just after it is placed in a fire?

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .

Sorry i dont understand the question can you rephase it?

Answer is (d)a brainliest would be appreciated