The answer is A- Alice Childress's play String, written 1969, an adaptation of Guy de Maupassant’s “A Piece of String” deals with class differences. It centers on how peculiarly and often unjustly social status is relied on to establish innocence or guilt.
In 1969 USA was undergoing a time of social unrest. Black people were fighting for social equality. This was a time when riots and political movements were common.