Final answer:
The correct answer is b) forcing employers to give workers food. Therefore, the correct option is B.
Step-by-step explanation:
The correct answer is b) forcing employers to give workers food. Labor unions used various strategies to protect workers, such as persuading politicians to make labor laws, getting benefits for hurt or sick workers, and going on strikes if employers would not bargain like collective bargaining. However, forcing employers to give workers food is not a strategy typically employed by labor unions.