Final answer:
Jon is likely an aerospace or electrical engineer, Jennifer a mechanical or materials engineer, and Laura a chemical or materials engineer, based on their respective job descriptions.
Step-by-step explanation:
Matching each job description scenario to the type of engineer involves understanding the various fields within engineering and what they specialize in. Jon, who works on developing drone technology, likely falls under the category of aerospace engineering or electrical engineering, as these fields are commonly associated with the creation and enhancement of aircraft and electronics. Jennifer, on the other hand, is involved in designing protective cases for handheld devices, which would be scoped under mechanical engineering or materials engineering as these disciplines focus on design, manufacturing, and materials science. Finally, Laura, who is working on creating scratch-resistant paint for automobiles, is likely practicing in the field of chemical engineering or materials engineering since the development of specialized coatings is a part of these engineering sectors.