What force is responsible for the repulsion between two positively charged particles?

Electromagnetic force

Explanation:

When two stationary charges are placed at some distance from each other then the force of attraction or repulsion between then is given by the equation

here we know that

= two charges

r = distance between two charges

now we know that the two charges are repelling each other then they must be of same type and if two charges are attracting each other then it must be of opposite nature.

So here force between the two charges are electrostatic force

neither accurate nor precise.

a is the best answer your welcome