Regarding the Historical Development of Employment Law in the U

Regarding the historical development of employment law in the U.S.,which of the following statements is true?

A) Most federal employment laws were passed in the first half of the 19ᵗʰ century in response to growing industrialization
B) The earliest employment laws focused on wages and hours
C) Most employment laws were passed with little conflict, since the need for these laws was evident to employers, employees and legislators.
D) The importance of employment at will has increased over time.
E) None of the above.