We can actually deduce here that the type of training technique that the dog owner using is C. Counterconditioning.
Counterconditioning is actually known to be a technique that is usually employed in animal training which involves conditioning an unwanted part or behavior of the animal into a wanted behavior or response. This is done by the association of positive actions with that response.
We see here that the scenario painted tells us that the dog owner began to use treats and rewards while the children pass and the aggressive behavior diminished. This is counterconditioning.
Learn more about counterconditioning on https://brainly.com/question/10382838
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