The correct option is A Bacteria
Citrus canker is a plant fest. It is a bacterial disease that is causes significant damage to the citrus species. It ruins the crop. Furthermore, it is found in more than 30 countries in Asia and South America. It spreads due to the movement of water splash, movement of the infected plants and the insects. The bacteria that causes citrus canker is bacterium Xanthimonas citri subsp.