Disease-caasing bacteria, often spread through contaminated water or food.

• A. Viral pathogens
• B. Parasitic pathogens
• C. Bacterial pathogens
• D. Fungal pathogens

Answer: (C)

The key idea is recognizing the type of disease-causing organism based on how it’s transmitted. The clue points to bacteria—tiny living cells that can cause illness when ingested through contaminated water or food. When water or food becomes contaminated with pathogenic bacteria, people can contract diseases such as gastroenteritis or more severe infections. This transmission route—contaminated consumables leading to infection—is a classic pattern for bacterial pathogens in public health.

Other pathogen types exist, but they aren’t described by this clue in the same way. Viruses can also spread via contaminated water or food, but they are not bacteria. Parasitic pathogens (like protozoa or worms) and fungal pathogens cause illnesses through different organisms and life cycles, and aren’t typified by the same water- or food-contamination pattern as bacteria.

In short, the description matches bacterial pathogens because it highlights disease caused by living bacteria transmitted through contaminated food or water, which is a hallmark of many public health bacterial outbreaks.