Answer:
d. a proton attracting an electron
Step-by-step explanation:
Electrostatic force is the interaction between bodies that have electrical charges
a and b
The neutrons are particles that have no charge, therefore there are no electrostatic forces acting
c
Electrons are negatively charged particles and when they interact with each other they repel because they have the same charge
d
Electrons are particles with negative charge and protons with a positive charge, and when interacting with each other they attract because they have different charge