Which of These Statements Is FALSE

Which of these statements is FALSE?

A) The official average workweek for most Americans information workers greatly underestimates the hours they really work.
B) If the Labor Department does not count the extra hours information workers put in on their laptops,cell phones,and personal digital assistants,it is overestimating productivity growth.
C) In most economic sectors Americans are less productive than workers in other mature economies.
D) Productivity growth in the U.S.has been constant since the mid-1990s.