The four statements that are true are the following.
A) The Democrats blamed the Republicans for the Stock Market crash of 1929. B) The Democrats won the Presidency in the 1990s but lost control of the Congress. C) The Democratic party is the oldest political party in the United States. E) The "Era of Good feelings" was a period from 1816-1824 where there was only one political party: the Democrat-Republicans.
The Democrats indeed blamed the Republicans for the Stock Market crash of 1929. The US stock exchange crashed on October 29, 1929, representing the beginning of the Great Depression. This major event has been the worst economic crisis in the United States. Thousands of people lost their jobs, banks went into bankruptcy, and companies closed.
Regarding the victory of the Democrats in the presidential election of the 1990s and the loss of control of the Congress, this made it very difficult for President Bill Clinton to pass much legislation in the face of the Republican opposition in Congress.