Concept:A primary cell is a non-rechargeable electrochemical cell.
It produces electricity until its chemical reactants are exhausted.
Explanation:In a primary cell, the chemical reactions that produce electricity are irreversible.
Therefore, once the active materials are used up, the cell cannot be recharged.
The alkaline battery is the most common example of a primary cell.
It is used in devices like torches, remote controls, and toys.
The other options listed are secondary cells.
Nickel-cadmium, lead-acid, and lithium-ion batteries all undergo reversible chemical reactions.
This means they can be recharged and reused many times.
Since the question asks for an example of a primary cell, the alkaline battery is the correct choice.
Answer:A. Alkaline battery