Which of these best describes heat transfer through conduction?

a) heat transfer as electrons are excited in atoms.
b) heat transfer by the emission of pure energy waves.
c) heat transfer by a liquid or gas flowing over an object.
d) heat transfer by molecules colliding with adjacent molecules.

The reaction will shift to the right

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 .