Answer:
b. work to identify root causes, not just symptoms.
Explanation:
The main thing on which Joseph Juran focused was on quality, how it could be improved in planning, and performing properly.
This provided for the quality controls, plans, improvements which could be made, but it did not work on finding the causes behind the lack that why it could not be achieved.
Accordingly it did not in manner focused on the finding the symptoms or root causes.
As it was focused on the action of now what can be done.