Why Do Sociologists Consider the "Scientific" Racial Types of Caucasian

Multiple Choice

Why do sociologists consider the "scientific" racial types of Caucasian, Mongoloid, and Negroid to be misleading and even harmful?

A) Every society's population contains a lot of genetic mixture.
B) Various racial categories are genetically very much alike.
C) The skin color of Caucasian people ranges from very light to very dark.
D) All of the above are correct.