Your answers are not incorrect, however not enough information is given with respect to this and other future application requirements to determine if the class specializations you have provided would be beneficial.

1st Question: The provided solution only considers the functional requirements of this application which is why specializations were primarily created for Country since processes are dictated by the regulatory agency for the country. There is no benefit for creating specializations for Manufacturing, Auto, and Boat divisions for this application. Other applications may or may not benefit depending on their specialization requirements.It is important to consider the functional application requirements over the organization structure when divising an enterprise class structure.

2nd Question:The Injury illness and reporting application cases are not speciailized by All Part, Boat Assembly and Car & Truck Assembly therefore this application will not benefit by these specializations. Other applications may or may not benefit depending on their specialization requirements.

3rd Question: By Work Groups I assume you mean class groups, since work groups are part of the Organization structure, not the enterprise class structure. As per above, the Injury illness and reporting application cases are not specialized by All Part, Boat Assembly and Car & Truck Assembly therefore this application will not benefit by these specializations.