The correct answer is D. A company offers free job-related education to employees
Step-by-step explanation:
Human capital is one of the necessary elements for production and refers to the qualities, knowledge, skills, abilities, etc. that a worker requires to perform a certain job and therefore support the process of production. This means an investment in human capital is an investment related to education or training and therefore, the one that represents this type of investment is "A company offers free job-related education to employees" because this type of education is directly related to the knowledge employees need at work and thus this belongs to human capital.