Both "A" and "B" answers are correct - ticks transmit viruses, bacteria, protozoa, filaria, richettsias and spirochettes.
Ticks transmit many serious diseases, including, but not limited to; Lyme Disease, Babesiosis, Relapsing Fever, Rocky Mountain Spotted Fever, and Ehrlichiosis.
Learn more:
What are tick-borne diseases?
From the American Academy of Family Physicians
Learn more about these diseases and other tick-transmitted diseases:
Tickborne Diseases from the Centers for Disease Control (CDC)
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