Hello!
Thrush is a condition in which fungus grows on the lining of your mouth. The fungus is like a creamy white color which can accumulate to the roof of your mouth, your throat, and your tongue. So therefore, the answer is B, disease of the mouth, characterized by small ulcers.
C. All staff members but possibly B. One in each class. However I believe C is most correct from what I know in my school district.
Answer:
the nervous system and other organ such as lungs liver heart and kidneys can be damaged