Before the Shipping Container, Cargo Had to Be Removed from a Ship

Before the shipping container, cargo had to be removed from a ship piece by piece, a very time-consuming process requiring a lot of dockworkers to accomplish. The shipping container allows a single dockworker to accomplish what it took several workers to do by moving many pieces of cargo all at once. The West Coast Dockworkers' Union was concerned about the change and demanded compensation from an association of shipping companies resulting in the Mechanization and Modernization Agreement of 1961. But, if automation increased wages, which of the following best explains why the workers resisted change?

A) The shipping container would make their job more pleasant, resulting in smaller wages.
B) They were unionized.
C) The machines would require additional labor market issues to operate.
D) The least productive members were concerned about automation.