Which of the following can best replace the word "well-worn" in the first sentence of Paragraph 9

A．the loss of a good memory because of the interference of certain parts of the brain
B．that people can do more with their brain
C．that brains are ready for a change
D．the retired people's fear for recalling their past

A．A man, who robbed two women he met on a telephone dating service after hypnotizing them with pills, failed in his third attempt.
B．In Japan, there are various ways of helping timid people to make new friends without feeling
embarrassed or getting involved in social contact.
C．Tamagotchi is also an electronic gadget for people to make new friends by "nurturing" an imaginary egg into a young chick together.
D．The widespread lack of social skills and tightly-knit communities led to Japanese people's problem in blindly relying on cell-phones or computers to make friends.