The survey sampling method that relies on randomly selected telephone numbers is called

A) quota sampling.
B) digital convenience sampling.
C) random digit dialing.
D) stratified random sampling.

Random Digit Dialing

A method of sampling telephone numbers at random for surveys, to ensure a representative sample of a population.

Telephone Numbers

A sequence of digits assigned to a landline or mobile telephone subscriber station connected to a telephonic network, through which the subscriber can be reached.