Answer: The correct answer is Option D.
Step-by-step explanation:
J.J Thomson was an English scientist who gave the existence of two subatomic particles which are protons (positive particles) and electrons (negative particles).
He gave a model which was known as plum pudding model.
In his model, he considered that an atom to be a pudding or a bed of positive charge in which negative particles are embedded such as plum on the pudding.
Hence, the correct answer is Option D.