Answer:
(c) deglobalization and the shift of production from places outside the U.S. to places within the U.S.
Step-by-step explanation:
The secular aspect of a trend is the main driver of that trend, and the secular aspect of the slowness in increases in U.S. labor productivity is not deglobalization and the shift of production from outside the U.S. to inside the U.S., since what has been happening in the latest decades is exactly the opposite.
Globalization has led many U.S. jobs, specially in manufacturing, to be shipped away from the country to other places where labor costs are cheaper, like China, Vietnam and Malasya.