Answer:
C. Employer: Location of employer
Explanation:
Usually, these kinds of email campaigns rely on geographical data of the user. However, Welcome Home's business is a specific segment - real estate.
In this case, the geographical location of the prospect may not be relevant if the prospect is in the vicinity of Welcome Home's properties but already owns a property.
On the other hand, the employer's location is extremely relevant, as the prospect may move to a location that is near his/her employer, and thus seek property according to that criteria.