Final answer:
The correct nursing goal for a patient with the nursing diagnosis of Risk for Infection after abdominal surgery is to instruct the patient's visitors in proper hand washing before direct interaction with the patient.
Step-by-step explanation:
The correct nursing goal for a patient with the nursing diagnosis of Risk for Infection after abdominal surgery would be option C: Patient's visitors will be instructed in proper hand washing before direct interaction with the patient. This goal focuses on preventing the spread of infection by educating visitors about proper hand hygiene. Option A focuses on the nurse's actions, option B focuses on the patient's white blood count, and option D focuses on the patient's understanding.