a. the daily lives of ordinary people
The realist movement was a result the exotic influence of Romanticism which led the common issues about the people and their problems and suffering which lay hidden behind the bars. The movement focused on the daily lives of the people which was based on direct observations about the modern world.
Hmmmmmm im not saying this is right but I honestly think its the Last one because none of them make sense in the sentence so yeah i think its the last one but im not sure