What is the significance of "probable cause" when conducting a search? A. It allows the police to search without any need of evidence. B. It requires the police to have reasonable ground; to believe a crime has been committed. C. It ensures the police have complete control over search locations.

The correct answer is B. "Probable cause" is a legal standard that requires the police to have reasonable grounds to believe that a crime has been committed before conducting a search. This means that there must be some evidence or suspicion to justify the search, rather than simply conducting a search without any evidence. Option A is incorrect because the police cannot search without any evidence. Option C is also incorrect because "probable cause" does not ensure complete control over search locations.