The correct answer is option 3: Sheep. Dolly was the first mammal to be cloned from an adult somatic cell, and she was a sheep. Cloning is the process of creating an organism that is genetically identical to another organism. In the case of Dolly, scientists took a cell from an adult sheep and used it to create a cloned embryo, which was then implanted into a surrogate mother sheep. Dolly`s birth in 1996 marked a significant breakthrough in cloning technology. It is important to note that while other animals, including dogs, cows, and hens, can also be cloned, Dolly is most commonly referred to as an example of a cloned sheep.