Final answer:
To run an RNA gel, a scientist would require a gel that can separate RNA molecules based on size and a voltage supply to apply a positive and negative charge.
Step-by-step explanation:
Gel electrophoresis is a technique used to separate molecules based on size using an electric field. In the case of running an RNA gel, the scientist would require a gel that can separate RNA molecules based on size (option A) and a voltage supply that can apply a positive charge at one end of the gel and a negative charge at the other end (option C). Therefore, the correct answer is option E, both A and C are required to run an RNA gel.