Answer:
B. Develop new technology for workers to be able to accomplish more
Step-by-step explanation:
Increasing productivity means doing more with the (human) resources you already have. So, having more machines/technology to assist your current workers do more products/services is the best way to increase productivity.
Answer A would be increasing production, not productivity.
Answer C. Not a good business strategy and unclear which effect it would have on productivity, since we don't know how the extra money would be spent.
Answer D. That's decreasing the production, opposite of answer A, not about productivity.