Answer:
Your answer would be D. mass and atomic stability
Explanation:
Only mass would change a neutron has no charge its neutral. Neutrons only have impact on the mass and atomic stability. As I worked on answering this my original answer would have been option a and then i realize that on the interactive website when there wasn't much balance with the protons and neutrons then it was unstable. So, therefore it would not just be mass. You have to include the stability.
