Main point:
Vehicles whose manufacturers identify and fix all design flaws will never have an accident.
Premises:
- Safety experts will perfectly identify any design flaw that could cause accidents.
- Material science will allow manufacturers to fix any such flaw.
Prethinking:
The conclusion says “never have an accident.”
That only works if every accident comes from a design flaw. Otherwise accidents could still happen due to weather, human error, etc.
Now eliminate choices:
A) Says each flaw has only one solution.
Not needed. Multiple solutions could exist.
B) Says material science will be the only important research area.
Irrelevant.
C) Says manufacturers will follow safety advice if convinced.
Conclusion already talks about manufacturers who “properly identify and resolve” flaws, so this is unnecessary.
D) Says all vehicles have some flaw.
Not required. Even if some vehicles are flawless, argument still works.
E) Says all accidents are at least partly caused by design flaws.
This is necessary. Otherwise accidents could happen for unrelated reasons, destroying the conclusion that accidents will never occur.
Answer: E