Final answer:
HR managers focus more on metrics due to increased technology integration, globalization of business, and an emphasis on diversity and inclusion, making 'All of the above' the most likely reason.
Step-by-step explanation:
The most likely reason that HR managers are more focused on metrics than they were 50 years ago is due to several intertwining factors. These include an increase in technology integration, which has revolutionized the workplace by enhancing productivity and efficiency. Furthermore, the globalization of business has expanded international trade, necessitating a more skilled and diversified workforce. The rising impact of foreign trade in the US economy and the competition with lower-skilled workers globally have also contributed to the necessity for metrics and more strategic HR management. Additionally, the increasing recognition of the value of diversity and inclusion in fostering positive work environments and the best talent pool is imperative. Therefore, the correct answer would be d) All of the above.