Verification of truth — necessary component for operation: A car must have which of the following to function on the road?

Introduction / Context:
This item asks for a must-have element of a car in practical operation. “Must” should be read as required for functioning in its intended use (driving), not merely a typical physical part of the object.

Given Data / Assumptions:

• We interpret “car must have” in the usage sense (to be driven), not museum display.
• Different models may lack certain body features (front bonnet, external bumper, separate trunk/dicky), but all require a person to operate unless autonomous (which remains exceptional and still supervised).

Concept / Approach:
Check each option for necessity under normal driving conditions. The human operator (driver) is essential; bodywork items vary across makes and eras.

Step-by-Step Solution:
Bonnet/dicky/bumper are design features that can be absent or configured differently.A driver is required to control, navigate, and ensure safety, satisfying the “must have” criterion.

Verification / Alternative check:
Legal and practical driving everywhere presumes a competent driver at the controls (setting aside rare, special-permission autonomous tests).

Why Other Options Are Wrong:
They are not universally required for the car to function as a vehicle.

Common Pitfalls:
Treating common physical parts as “musts” despite design diversity (rear-engine cars, integrated bumpers).

Final Answer:
Driver