Can someone help me with this I will guve brainliest

It is not B it is A, wave 1 waves are more spread apart so that means it has a bigger wave length, and the frequency is how many waves there are in one second so the smaller waves would have the higher frequency so it would be A hope this helps.

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 .