Try as She Might, Zoey Cannot Remember Anything from the First

Try as she might, Zoey cannot remember anything from the first three years of her childhood. Which of the following is NOT considered a possible explanation for infantile amnesia?

A) The creation of new memories interferes with the retrieval of early childhood memories
B) Brain structures are not developed sufficiently to form these long lasting memories
C) To form memories, the concept of self is needed, and this sets in approximately at age two
D) Failure to encode the experiences deeply, results in a lack of retrieval cues