Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-molecular theory?

Boyle's law which plays a major role in the kinetic-theory states that Volume and Pressure are inversely proportional 

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 .