The Reasoning Behind the Warrantless Search of Automobiles Is That

The reasoning behind the warrantless search of automobiles is that ___________ ​

A) vehicles traverse public roadways, there is noexpectation toprivacy in one's vehicle.
B) vehicles contain an area toosmall torequire a search warrant.
C) vehicles are movable and could drive away before the officer could obtain a warrant.
D) vehicles can have more than one driver, therefore they are not considered under the Fourth Amendment right tobe free from unreasonable searches.