The Difference Between the Terms Pathogenicity and Virulence Is That

The difference between the terms pathogenicity and virulence is that _______.

A) pathogenic organisms cause disease, virulent organisms do not
B) virulent organisms cause disease, pathogens do not
C) pathogens cause disease and their virulence describes the degree of pathogenicity
D) virulent organisms cause disease and their pathogenicity describes the degree of disease manifestations