Which of the following is a common characteristic of infectious diseases?
A) They are caused by genetic mutations and are not transmissible.
B) They are caused by pathogens such as bacteria, viruses, fungi, or parasites and can spread from one person to another.
C) They primarily result from long-term exposure to environmental toxins without any biological involvement.
D) They are solely influenced by lifestyle choices and do not involve pathogens or microorganisms.