A Certain Bacterium Infects a Plant's Upper Leaves

Multiple Choice

A certain bacterium infects a plant's upper leaves.A few days later,bacteria of the same species attempt to infect the same plant's roots but are unsuccessful.What process is responsible for the plant's ability to prevent this infection?

A) antivirulence response
B) pathogenesis resistance
C) systemic acquired resistance
D) sequential immunity
E) none of the above