Which of the Following Statements Regarding the Practice of Labour

Which of the following statements regarding the practice of labour hoarding is false?

A) It is most likely to occur with high-skilled workers.
B) It is most likely to occur in situations where quasi-fixed labour costs are high.
C) There is not a lot of empirical evidence that firms adopt this practice.
D) It is most likely to occur when most labour costs are variable.
E) It is most likely to occur with low skilled workers.