one consequence of automation is that producers need fewer\ncustomers.\nmachines.\nmaterials.\nworkers.

Brief Explanations:

Automation involves using technology to perform tasks. With automated processes, producers can rely on machines and systems instead of a large - number of human workers. Customers are needed for sales, machines are part of automation, and materials are still required for production. But workers are replaced by automated systems in many cases.

Answer:

D. workers