Your answer should be D, she is using the word "I."
I also had this question for my assignment and I had to write an essay about it. Here's what I wrote for your question
Its C Many people will take the ferry an have an experience similar to the narrator’s
Abigail seems to feed on Mary warren's insecurity and fear.
The more Abigail asserts herself, then the same way Mary loses all sense of herself.
They bring out an extreme trait to each other.