Which of the following types of pollution can be directly controlled?

Point source pollution refers to contaminants that can be traced back to a single, identifiable source, such as a pipe discharge from a factory or a wastewater treatment plant's outfall. Because these sources are specific and fixed in location, they can be effectively regulated and controlled through permits, monitoring, and enforcement by environmental agencies. This allows for direct management strategies, such as limiting the amount of pollutants that can be discharged and requiring specific treatment processes to reduce harmful impacts on the environment.

In contrast, non-point source pollution comes from diffuse sources that are not easily identified or traced. This includes runoff from agricultural fields, urban areas, and other widespread activities. Due to its dispersed nature, implementing controls over non-point source pollution is much more challenging, often requiring broad-based management practices, community involvement, and lifestyle changes rather than direct regulatory measures.

Therefore, point source pollution is the type that can be directly controlled, making it the correct answer to this question.