Final answer:
Dmitry Belyaev and Lyudmila Trut domesticated wild foxes through selective breeding.
Step-by-step explanation:
The successful domestication of wild foxes by Dmitry Belyaev and Lyudmila Trut was achieved through selective breeding. Selective breeding involves choosing specific individuals with desired traits to mate and produce offspring with those traits. In this case, Belyaev and Trut selected foxes that displayed less aggression and greater curiosity towards humans, creating a more domesticated population over time.