Answer :
Persuasion is the communication technique is most effective when handling patient complaints. Hence, option A is correct.
What is Persuasion communication?
Persuasive communication is the kind of communication in which there are a lot of attributes to enchant the way of communication.
Persuasive communication that succeeds addresses the audience's requirements, values, and desires. The audience is more susceptible to persuasive communication when a speaker appears to be akin to them, whether in terms of age, career, or socioeconomic status.
Thus, option A is correct.
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The options are missing in the question -
a. Persuasion
b. Bargaining
c. Negotiation
d. Non-verbal cues.