Why would pushing the south poles of two magnets together provide a good model for the fusion of two hydrogen nuclei?

Question

A. Some nuclei repel each other, and some attract each other, just like magnets.
B. The positive charges of the nuclei make it difficult for the nuclei to fuse, just like the repulsion of the two magnets.
C. If the nuclei fused, it would destroy both of them, just like the two magnets would be destroyed.
D. Only negative nuclei can fuse with positive nuclei, just like the north and south poles of magnets.

Answer 1

The best answer to why pushing the south poles of two magnets together provides a good model for the fusion of two hydrogen nuclei is:

B. The positive charges of the nuclei make it difficult for the nuclei to fuse, just like the repulsion of the two magnets.

This is because hydrogen nuclei (protons) are positively charged, and like charges repel each other. When trying to fuse two hydrogen nuclei, the repulsion due to their positive charges must be overcome for fusion to occur, similar to how trying to push the same poles of two magnets together results in a repulsive force.