Final answer:
The finding that indicates the nurse's goal for the patient's heart rate has been met is a heart rate of 78 beats/min on 12/3 since it's below the targeted rate and on the correct date.
Step-by-step explanation:
The nurse is evaluating if the expected outcome for the patient's heart rate being less than 80 beats/min by 12/3 has been met. The finding that will alert the nurse that the goal has been met is a. Heart rate 78 beats/min on 12/3. This is because the heart rate is below the target of 80 beats/min and is recorded on the specified date of the expected outcome.