Arelationship a relationship
a. consists of a connection between individuals or groups that rarely causes personal stress
b. consists of a connection between individuals or groups that interact
c. consists of a connection among strangers
d. consists of a connection that does not exist within families

I'd say the answer is B. It's most accurate out of the rest.
Hope that helps and good luck! :)

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases.