Final answer:
The statement that best contributes to the nurse's documentation of assessment of patient status is option C.
Step-by-step explanation:
The statement that best contributes to the nurse's documentation of assessment of patient status in the patient's medical chart is option C. "Patient complained of pain 7 of 10 at 7:45 a.m. Received pain medication at 8 a.m., reporting pain 3 of 10 at 8:30 a.m." This statement provides specific and measurable information about the patient's pain level and the effectiveness of the pain medication.