Answer:
The correct answer is option d.
Step-by-step explanation:
The productivity in the services sector is indeed difficult to improve. The services are not tangible physical products like goods. It is difficult to assess productivity. Services are not a standard product.
They are produced using mainly labor-intensive techniques because more than machinery it requires a professional skill set and experience to produce. It is custom made for each individual consumer and cannot be compared to a set standard or specifications.
Since services are not standardized they cannot be automated easily.