Final answer:
The fact that developed countries have strong, widely attended university systems indicates that universities teach skills used on the job.
Step-by-step explanation:
The fact that developed countries have strong, widely attended university systems indicates that (b) universities teach skills used on the job. These countries prioritize education and invest heavily in human capital, which leads to a highly educated and skilled workforce. This educated workforce contributes to a higher rate of economic growth, as individuals possess the skills needed in various professions.