The correct answer is before sentence three. Hope this helps.
Answer
If something makes no sense it means it is illogical, nonsensical, and unreasoned.:
Explanation:
The cause os electricians being unionized and the effect is having a hard time finding a job.
The cause of something is an event happens which has a consequence.
in this case, BECAUSE electricians were unionized. As a consequence, it was hard to find a job.
Hope I helped :)