Which of the Following Statements About Random Assignment or Randomization

Which of the following statements about random assignment or randomization is true?

A) The randomization process decreases the influence of researcher bias but can increase the effect of systematic bias in a study.
B) The randomization process decreases the influence of systematic bias but can increase the effect of researcher bias in a study.
C) With randomization, each subject has an equal and known probability of being assigned to any group in a study.
D) Randomization eliminates the need for informed consent.