The police excluded the possibility of revenge by eBay customers after ______.

A．It is a point at which the process of learning ends.
B．It is a phase which is crucial to the acquisition of a certain ability.
C．It is a phase after which we do not need to acquire a certain ability.
D．Mans and animals have a similar critical period for a certain ability.

A．he spent all the money on the new home in Hopkinton
B．he failed an the business in setting up Web sites
C．he earned a low income as an electrical engineer
D．he was unable to pay back the large sum of money