the disease-causing particles cells exposed to the disease toxins released by diseased cells disease-specific antibodies
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Scientists determined that specific agents produce specific diseases, and many are transmitted by sneezing. What must the droplets contain for a disease to be transmitted by sneezing?
Possibilities:
- the disease-causing particles
- cells exposed to the disease
- toxins released by diseased cells
- disease-specific antibodies

the disease-causing particles