Answer:
The correct option is;
The engineer incorrectly labeled the drawing; therefore, the project scale was incorrect
Step-by-step explanation:
In order for the machinist to finish making the car, he had to have access to a suitable detailed drawings that clearly modelled the car, therefore, ruling out option 1, 2, 4
Given that he found out that he is redoing the entire project, which require authorization from the engineer, before, inspection, therefore, the error in the life sized version was likely located by the engineer from within the drawing used to build the car