What Is an Important Advantage of HLA Testing by Molecular

What is an important advantage of HLA testing by molecular methods?

A) Molecular methods are inexpensive.
B) Many alleles thought to be different based on serological methods have actually been shown by molecular methods to be the same.
C) There is more lot- to- lot variability in antisera than there is in molecular oligonucleotide primers.
D) Although cells used for typing must still be viable, fewer cells are required to get an accurate typing.