The passage of electricity through an electrolyte solution is caused by the movement of ions.

Here's why:

* Electrolytes: These are solutions containing ions (charged particles) that can move freely.

* Electric Current: Electric current is the flow of electric charge. In an electrolyte solution, this charge is carried by the ions.

* Movement: When a voltage is applied across the electrolyte, the positively charged ions (cations) move towards the negative electrode (cathode), and the negatively charged ions (anions) move towards the positive electrode (anode). This movement of ions constitutes the electric current.

In summary: The movement of ions in an electrolyte solution is responsible for the flow of electricity.