Answer: A) chiefly concerned with redeeming the nation's cities.
Explanation: Social Gospel movement was the movement that was based protest that was started by the Christian for betterment of the social conditions for the urban poop people. They wanted to redeem the cities of nation by improving the people and condition on social and economic level.
Other options are incorrect because Andrew Carnegie didn't described about it firstly, belied of god about rich and poor is false , didn't wanted to offer material help to poor people and didn't initiated by American catholic church. Thus , the correct option is option(A)