The observation of significantly increasing number of imprinting disorders as Beckwith-Wiedemann and Angelman syndrome are MOST likely due to

(C). Several studies suggest that there may be a small but significantly increased incidence of imprinting disorders, specifically Beckwith-Wiedemann and Angelman syndrome, associated with assisted reproductive technologies such as in vitro fertilization and intracytoplasmic sperm injection. However, the overall incidence of these disorders in children conceived using assisted reproductive technologies is likely to be <1%.