Final answer:
The most representative statement of a collaborative nurse-physician relationship is option a) "I'm concerned about the medication's effectiveness for Mr. Black's blood pressure."
Step-by-step explanation:
The most representative statement of a collaborative nurse-physician relationship is option a) "I'm concerned about the medication's effectiveness for Mr. Black's blood pressure." In a collaborative relationship, the nurse expresses their concerns to the physician, showing their involvement and commitment to the patient's well-being.