Which of the Following Is an Example of Positive Technological

Which of the following is an example of positive technological change?

A) A firm offers workers a higher wage to work on weekends and at night. As a result, the firm is able to increase its weekly production of surf boards.
B) A firm buys an additional machine that it uses to make surf boards. As a result, the firm is able to increase its weekly production of surf boards.
C) A firm conducts a new advertising campaign. As a result, the demand for the firm's surf boards increases.
D) A firm's workers participate in a training program designed to increase the number of surf boards they can produce per day.