Which Scenario Exemplifies the Concept of Target Hardening

Which scenario exemplifies the concept of target hardening?

A) Mark lifts weights and trains in tae kwon do so that he will be prepared if someone tries to rob or assault him.
B) Josh installs a home security system in his house and adds lights in his side yard that are motion activated.
C) Joan buys a shotgun that she keeps under the counter while she works at her convenience store.
D) Mariel buys a large dog and keeps it in her backyard to scare away potential burglars.