Which is a heterogeneous mixture? a. a glass of tap water b. a mug of hot cocoa c. a jar of mixed nuts d. a gallon of milk

Wouldn't it be C since heterogeneous mixture means you are able to separate the composition. 

The correct answer is b

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 .