Answer:
Option (a) is correct.
Step-by-step explanation:
Human capital refers to the capital that plays a vital role for improving a nation's productivity. Human capital includes health, education, experience, skills and training. If the workers of a country become more healthier and educated then as a result the output of that country increases because of higher productivity of the workers.
This will also increases the earning of the workers. If a worker is healthier then they will be able to give 100% percent at work and become regular to work.
Alternatively, if a worker has more skills and experience then this will increase the human capital of a nation.