When the Variance $\sigma _ { z } ^ { 2 }$

Multiple Choice

When the variance $\sigma _ { z } ^ { 2 }$ of the error variable $\varepsilon$ is a constant no matter what the value of x is,this condition is called:

A) heterocausality.
B) homoscedasticity.
C) homocausality.
D) heteroscedasticity.