What is relation between radius and distance between the nearest neighbours simple cubic FCC bcc

The answer is the first option just took the test

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 .

Ametal with a large number of free flowing electrons most likely has good conductivity