For any competitive labor market,what change would have to occur to cause the labor supply to decrease and shift the supply curve left?

Question

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If the opportunity cost of work increases, for example, with the availability of higher paying job opportunities or an increase in the value of leisure time, workers may choose to work fewer hours or exit the labor market altogether. This would decrease the labor supply and shift the supply curve left. The number of firms or workers increasing would lead to an increase in labor supply and shift the curve right, and option B cannot be true since we need an answer.

For Any Competitive Labor Market,what Change Would Have to Occur