B - Antibiotics
Antivirals treat viruses, antifungals treat fungi, and OTC treatments are merely symptomatic treatment. Antibiotics typically dissolve the cell wall of bacteria meaning they explode, so they actually kill the bacteria.
Option D is correct.
A synapse is the opening between neurons that neurotransmitters pass through.
Kingdom because there are 3 kingdoms - Eukarea, Prokarya and Archaea
