Which of the following best describes genetic engineering?

Genetic engineering is best described as a technology involving changing a DNA molecule because it entails the direct manipulation of an organism's genes using biotechnology. This process allows scientists to add, delete, or alter genetic material at particular locations in the genome. By using techniques such as CRISPR, gene cloning, or recombinant DNA technology, researchers can create organisms with specific traits or capabilities, which can be beneficial in fields like agriculture, medicine, and industrial processes.

In contrast, selective breeding, as mentioned in another option, refers to the practice of breeding plants or animals for particular genetic traits over generations without the direct manipulation of DNA. Crossbreeding distinct breeds is also a more traditional biological approach that occurs through natural reproduction rather than through direct genetic modifications. Lastly, enhancing soil fertility does not relate to genetics; it focuses on improving the nutrient quality of the soil to support better crop growth, which is a separate agricultural concern not tied to genetic engineering directly.