Final answer:
Susan is denied into her husband's risk purchasing group likely because it is specific to photography-related businesses and she, as a doctor, has different business risks.
Step-by-step explanation:
Susan is likely denied into her husband's "Risk Purchasing Group" because such groups are typically formed by individuals or entities with similar business risks, which allows them to pool their resources and purchase insurance at a more favorable rate. Susan, being a doctor, would not have the same types of business risks as her husband, who is a photographer. Therefore, the risk purchasing group that her husband is a part of likely pertains to businesses related to photography, not medicine. This scenario also raises issues of legal rights in domestic partnerships and illustrates how different professions are organized with respect to risk management.