The Rationale the Supreme Court Has Used When Deciding Cases

The rationale the Supreme Court has used when deciding cases involving vehicle searches is:

A) vehicles were not protected at the time the Fourth Amendment was adopted.
B) vehicles that people sleep in, such as RV's, have privacy protection but other vehicles do not.
C) vehicles have lower level of privacy due to the fact that it is easy to see into them on the streets.
D) vehicles have lower level of privacy because they are personal property rather than real estate.