Since Atoms Are Mostly Empty Space,why Don't Objects Pass Through

Multiple Choice

Since atoms are mostly empty space,why don't objects pass through one another?

A) The electrons on the atoms repel other electrons on other atoms when they get close.
B) The nucleus of one atom repels the nucleus of another atom when it gets close.
C) The nucleus of one atom attracts the nucleus of a neighboring atom to form a barrier.
D) The electrons of one attract the nucleus of a neighboring atom to form a barrier.