Jen's dad sends her to the grocery store for a few last-minute dinner items. Jen repeats the list of 10 items as she walks to the store, but can only remember the first and last three items when she gets there—she is unable to remember the four in the middle. This U-shaped pattern of recall is

Acalled working memory overload.
Bthe key indicator of attention deficit disorder.
Ccalled the serial position effect.
Dcommon only in women.