Answer:
The correct answer is option D, that is, move up to another shell that would form.
Step-by-step explanation:
An atom comprises neutrons, protons, and electrons. The neutrons and protons are located in the nucleus and the electrons orbit the nucleus in their fixed shells. The jumping of the electron takes place to its higher shell when it acquires some form of energy, and can move to the lower shell when it loses some energy. Therefore, as mentioned in the given question, when a single electron gains a small amount of energy, then it should jump to another higher shell.