What Did Frederick Taylor Do to Help Cause the Decline

What did Frederick Taylor do to help cause the decline of skilled workers?

A) He interviewed skilled employees and broke their processes into easy to learn parts.
B) Taylor was hired by corporations to help them reduce the cost of labor and he did.
C) He tested worker endurance by using experiments to determine how much they could work.
D) Taylor wrote a series of newspaper editorials claiming that skilled workers wanted to block unskilled labor.