The largest majority of children working today work in

I believe the answer is: agricultural, fishing, and forestry job

Since these jobs tend to be located pretty far away from urban area, children protection service is much less likely to find occurence where children were included in the labour force. The majority of the children entered the labour force because their parents made them to.

answer; i believe the correct answer is (a) the correlation between the cause variable and outcome variable is zero;