Jack, a two-year-old fan of Teletubbies, probably enjoys watching that program because

a. of the fast-paced action
b. it has been around since 1969, which means that the producers know how to appeal to their target audience
c. the show features complex patterns and musical melodies from a wide range of cultures
d. the Teletubbies characters have infant-like bodies and facial features (including large heads with expressive eyes)

D