Which option justifies why it may take years to implement the design in the following scenario into mainstream production? Janis has developed a car that uses 30 percent less fuel than any other current model. Since fuel costs are so imperative in today’s society, this design is very ground-breaking and exciting.

Engineers prefer using more fuel and saving money on design changes.
Engineers know that society takes time to recognize and implement differences.
Engineers prefer to use systems that have proven to be effective and reliable.
Engineers know creating new systems will require new manufacturing processes that are not currently in use.