The Client Says to the Nurse, I Feel Really Close

The client says to the nurse, I feel really close to you. You are the only true friend I have. The most therapeutic response the nurse can make is,

A) I am sure there are other people in your life who are your friends; besides, we just met.
B) It makes me feel good that you trust me so much; it is important for the work we are doing together.
C) Since ours is a professional relationship, let's explore other opportunities in your life for friendship.
D) We are not friends. This is strictly professional.