Which best explains what happens when workers join a labor union
a. the workers get greater bargaining power
b. their wages decrease because of union dues
c. the government guarantees a minimum wage
d. employers can prevent stiles and slowdowns

When workers join a labor union the workers get greater bargaining power

Explanation:

Since the Industrial Revolution, labour union, generally an organized association of workers, have been focusing to protect labour rights and interests. Unions, over time, have spread its branches to various parts and today, a larger membership of workers is found in transportation and utilities.

A labour union generally have its influence on two tools: limiting labour supply and increasing labour demand. This helps in giving workers greater bargaining power. Through their collective bargaining skills, unions negotiate for the wages and can ask for higher wages.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."

answer; how about carl lewis;