When is it cheaper to make an international call

A．Direct dial.
B．Through the operator.
C．Reverse charge call.
D．Outside office hours.

A．no heart disease will be found if people don't drink coffee
B．no one should drink more than two cups of coffee a day
C．the more coffee people drink, the more chance they will get to have heart disease
D．women's heart disease has something to do with their drinking of coffee