A) An employer invests in technology training for his staff and immediately sees an increase in productivity that reduces his need to pay over time best describes how human capital impacts production costs. By investing in employee training and development, an employer can improve the skills and knowledge of the workforce, leading to increased productivity, efficiency, and quality of work. This can ultimately result in a reduction in production costs as the workforce becomes more skilled and capable of producing more output in less time, requiring fewer resources and lowering costs.