Which of the Following Quotations Illustrates Economic Growth

Which of the following quotations illustrates economic growth?

A) "The firm should lower the price it charges for widgets and gadgets."
B) "The firm should sell more gadgets, even if it means less widget sales."
C) "The more and more gadgets the firm produces, the bigger the fall in widget production."
D) "If the firm invests more in capital equipment, it can expand production next year."
E) "The firm has been able to lower costs due to its extensive experience in building widgets."