Man must …… to stop pollution. A. act B. perform C. operate D. behave

The correct answer is: act.

• Act means to do something, especially something that is important or necessary. In this case, it means that humans must take action to stop pollution.
• Perform means to do something that is difficult or requires skill. In this case, it does not mean that humans must perform a difficult task to stop pollution.
• Operate means to control the working of a machine or device. In this case, it does not mean that humans must control the working of the environment to stop pollution.
• Behave means to act in a particular way. In this case, it does not mean that humans must act in a particular way to stop pollution.

Humans can take many actions to stop pollution, such as:

• Reducing their use of resources, such as water and energy.
• Recycling and reusing materials.
• Using less polluting forms of transportation, such as walking, biking, or public transportation.
• Supporting businesses and organizations that are working to reduce pollution.

By taking these actions, humans can help to protect the environment and stop pollution.