Placing Signs in Raised Flower Beds Protects Signs from Vandalism

Placing signs in raised flower beds protects signs from vandalism because people resist trampling the flowers to get to the sign. This is an example of how architects using psychological research are able to prevent vandalism by

A) using biodata.
B) "hardening" and "de-opportunizing" public settings.
C) appealing to the sensations and perceptions of the public.
D) appealing to the "aesthetic nature" within each person.