The Following Are All Disadvantages of a Piecework Incentive Plan

The following are all disadvantages of a piecework incentive plan except that

A) in workers' minds, production standards become tied inseparably to the amount of money earned.
B) piece-rate plans appear equitable in principle.
C) new job evaluations produce a new wage rate and thus piece rates need to be revised.
D) employers arbitrarily increase the standard because of workers earning "excessive"wages.
E) workers resist attempts to raise production standards.