Answer:
B. Thompson - Cathode Ray Tube/Plum Pudding
Explanation:
The scientist and the model/experiment that unintentionally discovered the electron was the Thompson's - Cathode Ray Tube/Plum Pudding.
Experiments on the discharge tubes was performed by J.J Thomson in 1897 and this led to the discovery of the electron as a subatomic particle.
The properties of the cathode rays were studied and presented by Thomson in his work at that time.
