Final answer:
The correct statement indicating an understanding of crime reduction strategies is 'I should avoid opening the door for strangers,' as it aligns with basic personal safety guidelines.
Step-by-step explanation:
The community health nurse is discussing crime reduction strategies for older adult clients. From the given options, statement b) "I should avoid opening the door for strangers" clearly indicates an understanding of the presented crime prevention information. This is aligned with standard personal safety advice that helps in preventing potential criminal situations. In contrast, carrying a concealed weapon may not be effective or legal for all individuals and could increase the risk of harm. Walking alone at night, even in well-lit areas, poses a danger, as does sharing personal information with new acquaintances.