What was the "unprecedented task before us" that required "undelayed action" according to franklin roosevelt?

Franklin D Roosevelt was referring to the great task of dealing with the Great Depression. This quote is from his first inaugural address as he set to quickly deal with the worst depression the US had ever seen. It is also a shot at the Hoover administration for doing too little. FDR had an immediate plan and set forth the first ever First 100 Days plan. This will eventually become a precedent and expectation for later presidents and the measure of their plan--what can you get done in the first 100 days? 

The bystander effect  for some reason my history teacher was talking about this 

They are both unlikely.  certain would be 100%, likely would be anywhere above 50%, and unlikely would be under 50%can i have brainliest, ?