Which of the Following Statements Is True

Which of the following statements is true?

A) A firm cannot increase quantity demand for labor when the wage rate falls without causing the product price to decline.
B) A movement along the market demand curve for labor does not require a change in the product price.
C) A firm can increase quantity demanded for labor when the wage rate falls without affecting the product price but the industry cannot hire more workers without causing the product price to fall.
D) Both a firm and the industry can move down their demand curves for labor without causing product price to change.