Final answer:
Reducing the duration of patent law protection is the most likely policy to preserve incentives to innovate while reducing inefficiencies.
Step-by-step explanation:
The policy that is most likely to preserve socially desirable incentives to innovate while also reducing inefficiencies is option D) reducing the duration of patent law protection. By reducing the duration of patent law protection, it allows firms to recover the costs associated with developing a new product while preventing them from earning outlandish profits. This solution strikes a balance between providing inventors with incentives to innovate and preventing excessive monopoly profits that lead to deadweight losses.