The correct answer among the listed given choices is letter c. Contagious diseases are due to contact with an infected person.Contagious Diseases
-is a subset category of transmissible or communicable diseases. These diseases can be transmitted to another person either by:direct contact -physical contact with the person suffering the diseaseindirect contact -by casual contact with their secretions or objects touched by them or airborne route among other routesExamples of Contagious DiseasesHIV/ DiarrheaMalaria
Generally speaking, it was known that diseases can be eithercommunicable or non-communicable
Communicable diseases are known to be diseases due to an infectious process and can be transmitted from one person to another. Because of this, proper and effective prevention and control of communicable diseases is a public health concern.
For other related topic about information on communicable diseases
Use you saliva I guess
Ehh kasi sabi mo na paano maligo ng walang tubig