Which of the following is an example of DNA technology?

The example of DNA technology is cloning because it involves manipulating and utilizing genetic material. Cloning refers to the process of creating a genetically identical copy of an organism or cell, which is directly related to the understanding and application of DNA. In this process, scientists use techniques that involve DNA extraction, replication, and the use of vectors to insert genes into organisms, thereby employing knowledge about genetics and DNA structure.

In contrast, reforestation, soil erosion control, and wastewater treatment do not specifically involve manipulating DNA directly. Reforestation is focused on ecological restoration, soil erosion control deals with conservation practices, and wastewater treatment involves the management of polluted water, which may include biological processes but not necessarily DNA technology. Hence, cloning stands out as the explicit application of DNA research and genetic engineering techniques.