Answer:
TFP dropped and labor productivity increased because firms laid off the least productive workers.
Step-by-step explanation:
Total factor productivity refers to the ratio of aggregate output to aggregate inputs. It is also known as multi-factor productivity.
It represents growth in real output which is more than the growth in inputs including labor and capital.
The concept of TFP was first developed by Tinbergen (1942) and Stigler (1947).
Statement c. is a plausible explanation