Antigenic shift refers to the combination of two different strains of influenza; in contrast, antigenic drift refers to the natural mutation of a single strain of influenza.

A) influenza; in contrast, antigenic drift refers to the natural mutation of a single strain of influenza
B) influenza, different than the natural mutation of a single strain, known as antigenic drift
C) influenza, in contrast to the natural mutation of a single strain, known as antigenic drift
D)influenza, different than antigenic drift, which refers to the natural mutation of a single strain of influenza
E) influenza; in contrast to antigenic drift, which refers to the natural mutation of a single strain of influenza

OAA

Hi Experts ,

Please explain optionE

Many thanks in advance.

SJ