The improvement in the quantity of labor can be seen as increasing in the number of immigrants. Thus option B is correct.
Immigrants refer to people who move to a new country in search of food, occupation and better livelihood by moving from their native place. When the immigrants reached any country the labor force increased.
The immigrants b the new country by fulfilling their expectations with their skills and helps in fulfilling the position with their increased numbers. These numbers increased the supply of workers in the market.
Therefore, option B immigrants increase the labor force is appropriate.
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