This force involves the attraction between charged particles.
select one:
a. strong nuclear
b. gravitational
c. weak nuclear
d. electromagnetic

A. Strong Nuclear force must be the correct option instead of electromagnetic force because electromagnetic force can be attractive as well as repulsive depending on the charge. Strong Nuclear force is always attractive in nature. This force is responsible for the attraction of electrons towards nucleus. Strong Nuclear attraction is between protons and neutrons which are strongly attracted to each other in the nucleus. Hope it cleared your doubt.

This force involves the attraction between charged particles are known as "Electromagnetic Force"

In short, Your Answer would be Option D

Hope this helps!

'b ' is the correct conclusion.

The answer is a blackhole. hope this !