To answer this question, you need to understand idioms and their meanings. Let's go through each option to understand why it is correct or incorrect:
Option A) "living high off the hog on" - This option is incorrect because it does not convey the meaning of "watching and controlling" the workers. Instead, it means to live extravagantly or enjoy a luxurious lifestyle.
Option B) "riding herd on" - This option is correct because it means to closely supervise or closely monitor someone or something. It aligns with the expression "watching and controlling" the workers.
Option C) "horsing around with" - This option is incorrect because it means to engage in playful or silly behavior. It does not convey the meaning of "watching and controlling" the workers.
Option D) "going ape with" - This option is incorrect because it means to become extremely angry or lose control. It does not convey the meaning of "watching and controlling" the workers.
The correct answer is B) "riding herd on." This option is correct because it accurately replaces the expression "watching and controlling" in the given sentence.