Which of the Following Characteristics Makes Randomized Controlled Trials (RCT)

Multiple Choice

Which of the following characteristics makes randomized controlled trials (RCT) different from other types of quantitative research studies?

A) An RCT is clinical in nature and is conducted in a healthcare setting.
B) RCTs only use one type of experimental design during research.
C) An RCT requires subjects to first sign a confidentiality agreement.
D) RCTs use a small number of subjects from a single geographic area.