When city dwellers fail to respond to ordinary traffic sounds, it is an example of:?

The correct answer is habituation.

Habituation refers to the type of learning in which a creature abatements or stops its reactions to a stimuli after rehashed or delayed introductions. Basically, the creature figures out how to quit reacting to a jolt which is not any more naturally important. For instance, living beings may habituate to rehashed sudden uproarious clamors when they take in these have no outcomes.