Final answer:
The correct definition of a craft union is a labor organization that represents skilled workers. It is a type of labor union that specifically aims to improve the working conditions and wages for members with certain skills and trades.
Step-by-step explanation:
A craft union is a type of labor organization, but to specifically address the student's question, the correct definition among those provided is that a craft union is: d. a labor organization that represents skilled workers. Craft unions represent workers who have specific skills and trades and they focus on improving the working conditions, wages, and benefits for their members within those trades.
The labor union is a broader term that includes various types of unions, serving as an organization where workers have collective bargaining power to negotiate with employers over various employment issues such as wages and work conditions. Collectively, they operate in a way similar to a monopoly in the labor market to balance the power dynamics between employers and employees.
Labor unions can also employ tools such as strikes to advocate for their member's rights and have played a significant role in shaping labor laws and practices over the years.