With modern audio- recording equipment, there is (are) ______.

A．no difficulty in recording speakers in many face -to-- face situations or on the telephone
B．still some difficulties in recording speakers in many face -to -face situations or on the telephone
C．no difficulty in recording speakers in many face -to -face situatious but some on the telephone
D．some difficulties in recording speakers in many face -to -face situations but not on the telephone