In the 1870s, began to investigate factory conditions.
a. new york
b. pennsylvania
c. massachusetts
d. new jersey

In the 1870s, Massachusetts began to investigate factory conditions. Option C is correct.

The Bureau of Statistics and Labor in Massachusetts was the earliest organization among the nations in 1870. Their first annualy report in 1870 provided detailed information describing accidents which involved children working in a factory such as textile mills as well as paper mills and the like.

answer; i believe the two groups were irish immigrants and chinese immigrants;

when in doubt choose c

it's what my teacher told my class when we were going into psats