The correct answer is A) Segregation and low wages.
A push factor is a condition that makes it so that an individual wants to leave a certain area. In this case, many African-Americans wanted to leave the South during the early 1900s because of segregation and low wages.
During this era, there were segregated facilities for African-Americans and whites. This includes schools, restauraunts, movie theaters, etc. These segregated facilities were much different, as most facilities for white citizens were much nicer than those for African-American citizens.
Along with this, African-Americans were paid much less than their white colleagues. These two factors resulted in African-Americans heading to Northern states for more economic and social opportunities.