Final answer:
Jeremy Westbrook's food company, which shows a continuous increase in profits and revenues, is experiencing sustained growth.
Step-by-step explanation:
Jeremy Westbrook's organic food company, which has increased both its profits and revenues over an extended period of time, is experiencing sustained growth. This is because the term 'sustained' implies a continuous and consistent increase over time without interruptions, which aligns with the description of the company's performance. The other options do not as accurately capture the consistent and ongoing nature of the company's growth.