Which of the Following Is Correct with Regard to Productivity

Which of the following is correct with regard to productivity?

A) Productivity does not vary much across different industries.
B) Productivity is not important to labour unions when they are negotiating a new collective agreement,but it is important to investors.
C) Activities like web surfing,social networking,and water cooler conversations inhibit productivity.
D) Increased productivity allows companies to pay workers higher wages without raising prices to consumers.
E) All of these statements are correct.