I would say A. It would be difficult to find workers for jobs that people didn't desire. Like how minorities pick produce nowadays and you don't hear of white people picking produce.
Answer: Abundant natural resources (coal, iron, oil); Abundant labor supply; Railroads; Labor saving technological advances (new patents) and Pro-Business government policies.
what is the question your asking?
Option 1,2,and 4 are correct. Judaism and Christianity's Roots are very similar due to both believing the holy books(Old testament/torah) and share the ancient stories(both coming from Israel) same language etc. Christians believe that the Messiah was Jesus and fulfilled the mosaic laws but Jews believe that the messiah hasn't arrived. Christianity really begins to expand forwards when the Old testament (torah) ends in the bible and the new testament begins.