What kinds of working conditions did laborers encounter during the second industrial revolution?
well ventilated
largely unsafe
tightly regulated
mostly pleasant

largely unsafe

Explanation:

The working conditions of the second industrial revolution were unsafe, crowded and horrible.

Workers, many of them small children, worked in reduced spaces and under unhealthy conditions. The fumes of the factories and the long shifts were a cause of illness. There were no regulations in place and children would often take dangerous jobs.

it's not the readmission