Answer:
The central route of persuasion
Explanation:
The central route of persuasion was proposed by Petty and Cacioppo. It has been believed that the attitude of individual work based on two ways.
The central route of persuasion: It has occurred when an individual is persuaded their action based on their content of the massage and based on argument.
The peripheral route of persuasion
Thus in the above statement, a robber is holding hostages. Negotiators used here the central route of persuasion.