Answer: 1. real GDP declined.
Explanation:
If labor productivity fell yet the workforce did not increase, that means that for Years 1 and 2, workers were producing less than they were producing before because the same number of people were producing.
This means that the amount of goods produced in the country would reduce and therefore GDP would reduce as well as GDP is the amount of goods and services produced in a country. If labor productivity had fallen yet the work-hours had increased, the increase in worker hours would have made up for the loss of labor productivity.