Answer: Option B
Explanation: As per the US law, a firm having less than five hundred employees in its business is classified as a small firm. These could be partnership, company or a sole proprietorship.
These business operate on a smaller level but the number of such firms is really high in market. Thus, these firms generate a lot of employment in an economy as the constant need of employees resulting due to high potential of growth.
Thus, from the above we can conclude that the correct option is B.