Concept:The electrical conductivity of an acid solution is determined by the availability and movement of charged particles (ions) in the solution.
Explanation:When an acid dissolves in water, it ionises to produce positive and negative ions.
These ions act as charge carriers that allow electric current to flow through the solution.
The overall conductivity depends on two main factors: the total number (amount) of ions present in the solution and how quickly those ions can move towards the electrodes.
A higher concentration of ions provides more charge carriers, which increases conductivity.
At the same time, larger or more heavily solvated ions move more slowly, which lowers conductivity.
So conductivity is not determined by concentration alone or by mobility alone; both factors work together.
Thus, the correct option is the one that mentions both the amount of ions and their mobilities.
Answer:A. amount of ions present and their mobilities