The expression "pitch in with" (Line 2, Para. 2 ) probably means ________.

A．too many corporations take no notice of the security problem of computers
B．criminals are sacrificing security for speed and accessibility
C．it's very easy to sacrifice security for speed and accessibility
D．many companies suffer from computer hacking because they .value speed and accessibility more than security

A．not all hacking attempts are worthy of investigation
B．information of the victims is inaccessible
C．InfraGard chapters will be in effect by the end of September
D．Amazon.com was often disrupted by hacking