The correct answer is C. Lead, Contact, and Opportunity, as keyed by the uploaded study guide.
These three standard objects correspond to different parts of the realty customer's sales lifecycle. A Lead can represent a prospective home buyer before that person becomes an established customer relationship. A Contact represents the individual once that relationship is maintained within Salesforce, while an Opportunity represents the potential sales transaction being pursued.
That combination fits the scenario because brokers need to track people who begin by shopping for homes, establish contact with the real estate company, and potentially progress toward a transaction.
Option A includes Address and Property, which are not the three standard objects identified by the study guide for this lifecycle.
Option B includes Account, Person Account, and Contact, but this combination does not represent the prospect-to-sales-opportunity progression the guide is testing.
The UX significance is that the underlying object model should reflect the business stages users actually work with. Brokers need to distinguish prospective buyers, known individuals, and active sales opportunities rather than treating all information as one undifferentiated customer record.
Study Guide reference/topics: Lead, Contact, Opportunity, Salesforce standard objects, customer lifecycle, Declarative Design.
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