OE
The sentence gives two clues about the engineer: she is not interested in making products that match “market needs,” and her work is known more for “its technical brilliance” than for “its _________ potential.” Her work is technically good, then, but does not necessarily match “market” or customer needs; that is, it lacks “commercial” potential. Work that has technical brilliance could very well have lots of “scientific,” “academic,” or possibly even “revolutionary” potential; therefore none of these answer choices can be correct, since they do not offer any contrast. “Ergonomic” is a tempting choice since a brilliant piece of engineering might be quite uncomfortable for its user, but an engineer who lacks interest in developing needed products would not necessarily think to create uncomfortable products.
Answer: C