A film with sound is best defines a "talkie" during the 1920s, Hence, option A is correct.
What is talkie?
A portable, battery-powered radio transmitting and receiving system that is small and easy to carry.
The mid-to-late 1920s saw the initial stages in the commercialization of sound cinema. The sound pictures initially. Talkie is used in the military and the cops for the emergency message and at that time signals are not that much clear and the sound was not accurate.
Some of the walkie-talkie are radio transmitters, two-way radio receivers, walkie-talkies, portable transmitters, radios, field radios, pagers, intercoms, remote controls, and hands-free.
Thus, option A is correct.
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