Pls help me 36 points

Apoet can make powerful, but subtle statements a) overstatement b) irony c) paradox d) understatement

Historians have recently discovered a historical journal published in the early twentieth century. the journal contains facts based on original sources about the downfall of the early byzantium empire. historians consider this long-lost journal to be a breakthrough in their understanding of the byzantium empire. based on this information, the journal is a source.

Which of the following was probably the most difficult challenge facing construction of the railroad?