What is the topic sentence in the following paragraph? body paragraph #1 the rapid increase in national wealth in the early 1920s was a surprising cause of the great depression. in the period just preceding the depression, the nation’s total income rose from $74.3 billion in 1923 to $89 billion in 1929 (“the great depression”). there was an uneven distribution of income between the rich and the middle class, between industry and agriculture within the united states, and also between the united states and europe. the speculation in the late 1920s kept the stock market high. however, the uneven balance of money created an unstable economy, and as a result the market crashed in 1929 (“great depression - library”). investors lost money and companies had to lay off large numbers of workers. it was very hard for unemployed people to find jobs. a. the rapid increase in national wealth in the early 1920s was a surprising cause of the great depression. b. in the period just preceding the depression, the nation’s total income rose from $74.3 billion in 1923 to $89 billion in 1929 (“the great depression”). c. the speculation in the late 1920s kept the stock market high. d. investors lost money and companies had to lay off large numbers of workers. e. it was very hard for unemployed people to find jobs.