Answer:
Answer is Option A: long hours, unsafe working conditions, and hard labor
Step-by-step explanation:
In the late 19th century, there was unfair hiring and unacceptable working conditions. Unemployment was high and very less skills were required (because of more use of machines) to be employed in the industries which meant that the workers could be replaced easily. Also, the working hours were very long. All of these led to formation of labor unions. They were formed to protect the common and most needed interests of the workers. They fought for better salaries, short working hours and better working conditions in the industry.