Why are elsectrons were not pulled into the atomic nucleus by this attraction

In classical physics, electrons should fall into the nucleus even if they weren't attracted by the charge of the proton. Early models of atoms had electrons orbiting the nucleus the way a planet orbits a sun. Orbiting in a circle means making a lot of changes of direction- which means acceleration. When an electrical charge undergoes acceleration it gives off electromagnetic radiation. Electromagnetic radiation is energy, and the electron can lose one of two kinds of energy; kinetic energy (or speed), or potential energy (or distance from the nucleus). Either way, it will eventually crash into the nucleus.

Explanation:

(oh and btw u may have posted this in the wrong subject XD)

the answer might be either a or c. can't be too sure , because i searched the web, but no valid answers came through.