Which of the following is a biological control example?

The example of biological control provided by lady beetles highlights a method in pest management that utilizes natural predators to help control pest populations. Lady beetles, also known as ladybugs, are well-known for their role in controlling aphid populations, which are harmful to various plants. By introducing or conserving lady beetle populations, gardeners and farmers can reduce the need for chemical pesticides while maintaining a healthier ecosystem.

Other options, while useful in certain contexts, represent different methods of pest and weed management or cultivation practices. Hand pulling is a physical method of removing weeds, aeration is a cultural practice for soil health, and scalping involves cutting grass to a short height. While these practices can be effective for specific situations, they do not involve the use of biological agents to manage pest populations as lady beetles do.