Final answer:
Greg would most likely use selective breeding to produce less skittish sheep by selecting and breeding individuals that naturally exhibit lower levels of skittishness, thus enhancing this trait in the offspring.
Step-by-step explanation:
If Greg, an agriscientist, is looking for a way to produce less skittish sheep, the most likely method he would use is selective breeding. Selective breeding, also known as artificial selection, is the process where humans select which animals to breed based on specific traits they wish to propagate. This method has been used to enhance various characteristics in both plants and animals, such as increasing milk production in cows or creating dog breeds with certain temperaments. For sheep, Greg would choose individuals that are naturally less skittish and breed them to create offspring with this desired trait, thus over time producing a flock with lower levels of skittishness.
Options like natural selection or epigenetics are not reliable for achieving increased docility in sheep within a controlled agricultural setting, as they either rely on processes occurring without human intervention or involve changes in gene expression that may not be inherited. The correct option in Greg's case would be selective breeding.