The most likely result of this investigation is:
B. The marble released from a distance of 15 centimeters will have the most potential energy transferred into kinetic energy, causing the marble to travel the farthest.
As the student pulls back the slingshot further, they are increasing the potential energy stored in the slingshot. When the slingshot is released, this potential energy is converted into kinetic energy, which propels the marble. Therefore, the further the slingshot is pulled back, the more potential energy is converted into kinetic energy, resulting in the marble traveling the farthest when released from a distance of 15 centimeters.