Final answer:
The assertion that the ADEA was the primary cause for the expansion of HR workload is false; the ADA of 1990 had a more significant impact due to its broader requirements for reasonable accommodations and accessibility provisions.
Step-by-step explanation:
The statement that the Age Discrimination in Employment Act (ADEA) was the primary legislation causing the expansion of human resources' workload is False.
While the ADEA, passed in 1967, did provide protections against age discrimination in the workplace, the Americans with Disabilities Act (ADA) of 1990 had a more significant impact on expanding the responsibilities of human resources departments.
The ADA not only prohibits discrimination based on disability but also requires employers to make reasonable accommodations for employees with disabilities and ensures accessibility in public spaces, thus increasing the compliance and accommodation obligations for businesses.