I would say it gives you information about the action going on in the setting so
C-Action would be your answer
A call will be made by my friend to me.
Mental illness
The narrator of the story has a mental illness, but this story is about what happens when a mental illness goes untreated. Her husband, a doctor, does not do what is necessary to help his wife and so she recedes deeper and deeper into madness as the story progresses.