When locating ADSL/ADSL2+ faults, which of the following may cause users to make calls but not access the Internet?

When locating ADSL/ADSL2+ faults, which of the following may cause users to make calls but not access the Internet?
A . The configuration of the interlace depth of the line configuration template is unreasonable
B . ADSL Modem failure
C . User outside line interruption
D . None of the above

Answer: B