How Can We Calculate How Much of the Variation in Y

How can we calculate how much of the variation in Y is situated at each level?

A) By dividing the log likelihood on the number of units in the respective levels
B) By running your full model and then calculating the intraclass correlation coefficient
C) By dividing the level-1 residual on each of the higher-level residuals
D) By running an empty model and then calculating the intraclass correlation coefficient