Which is the best example of how to revise the sentence to include formal language?
and
O The Great Depression was bad because people were
really poor and didn't work.
O The Great Depression was a difficult economic period
because many didn't have jobs.
The Great Depression was a difficult period of history,
as the majority of citizens were without work.
O The Great Depression was a hard time in US history
because lots of people didn't have enough money.