## The reasoning
The **battery** is specifically designed to store electrical energy chemically and release it as electricity when needed. In a car, it powers the starter motor, lights, radio, and all electrical systems — especially when the engine is off. This is a straightforward application of **energy storage principles**: batteries convert chemical energy into electrical energy and vice versa.
Think of it this way: when you charge your phone, the battery *stores* that energy for later use. A car battery does the same thing, just on a larger scale.
## Why the wrong options tempt you
**Radiator (A)** — sounds technical and is important in cars, but it *cools* the engine using liquid, not electricity.
**Carburettor (C)** — mixes air and fuel for combustion in older engines. It handles fuel, not electrical energy.
**Muffler (D)** — reduces exhaust noise. It's about sound, not energy storage.
These parts are all crucial, but they deal with *thermal, mechanical, or chemical processes* — not electrical storage.
## Quick takeaway
**Only the battery stores electrical energy; the other parts manage heat, fuel, or sound.** Remember: "Battery = electrical storage" — it's in the name!