How is plague primarily transmitted to humans?

Plague is primarily transmitted to humans through the bite of infected fleas that are typically found on rats or other rodents. This means that option B, which mentions scratching feces into the skin, does not align with the standard transmission route associated with plague.

The correct method of transmission for plague is through contact with infected animal tissues, bodily fluids, or flea bites, rather than direct contamination through feces. While certain practices involving handling waste can pose risks for different infections, they are not the appropriate primary mode of transmission specifically for plague.

Airborne transmission, consumption of contaminated food, and direct contact with infected blood are also not the primary routes for plague. Plague outbreaks primarily relate to interactions with specific wildlife reservoirs, especially through flea bites. Understanding these details is crucial for recognizing the public health implications and prevention strategies related to plague transmission.