When the Prosecuting Attorney Attempts to Introduce Evidence Obtained as a Result

When the prosecuting attorney attempts to introduce evidence obtained as a result of a consent to search into court evidence,the court requires that the:

A) defense prove beyond a reasonable doubt that the consent was involuntary.
B) defense prove that there is probable cause to doubt that the consent was involuntary.
C) prosecutor prove beyond a reasonable doubt that the consent was voluntary.
D) prosecutor prove by a preponderance of the evidence that the consent was voluntary.