Final answer:
The statement that RDDs involve the intentional release of radioactive materials shows effective learning about RDDs. They are designed to disperse radiation rather than to cause immediate physical injuries or explosions.
Step-by-step explanation:
The correct statement made by a nursing student that indicates effective learning about radiologic dispersal devices (RDDs) is: B) "RDDs involve the intentional release of radioactive materials." RDDs are often referred to as "dirty bombs" and are designed to disperse radioactive material through conventional explosion methods, thereby causing contamination of the area with radioactive substances. RDDs are not primarily for creating an actual explosion in the location such as the emergency department but rather for the dispersion of radioactive material. They are also not classified as chemical weapons and their primary harm does not come from immediate physical injuries but from the prolonged exposure to the radiological materials dispersed.