Answer:
C. Recessions were more severe and lasted longer int he first half of the twentieth century and became shorter and milder in the second half
Explanation:
recessions in the late 20th century were only half as severe as those in the late 19th century for example, even the average growth rate was similar in both periods. Recessions in the 90s prove to be milder than those in the 70s or 80s. The duration of the recoveries is not significant related to the duration or severity of the preceding recessions not impliying a slow recovery for recent mild recessions