Final answer:
The shortest recession since the end of World War II up to 2019 lasted six months, from January to July 1980.
Step-by-step explanation:
When analyzing the economic recessions that have occurred since the end of World War II up to 2019, it is clear that recessions have varied in length, with the shortest recession during this period lasting six months.
This six-month recession began in January 1980 and ended in July 1980. If we examine the table closely, it lists the Months of Contraction for each recession, allowing us to determine the length of each economic downturn.
Narrowing down the shortest recession based on provided data, we find that the correct option is the one that indicates six months duration, which is significantly shorter than the average recession length since WWII, identified as 11 months or slightly less than a year.