推断划线部分在上下文中应有的意思（题中单词被隐去若干字母，并非乱码）:
Strictly, a c#nt#g#ous disease is one transmitted by physical contact, whereas an infectious one is transmitted via microorganisms in the air or water. In practice, there is little or no difference in meaning between the two.
A、that can be cured
B、that can be transmitted through contact
C、that has something to do with air or water
D、that has something to do with one's physical condition