Final answer:
Dr. Bogdarian likely noticed the title used in her address, which should properly be 'Dr. Bogdarian' unless she prefers a different title such as 'Professor'. Using correct titles is important in professional communication.
Step-by-step explanation:
When Dr. Bogdarian noticed something about one of her students' address, it is most appropriate to assume she would be attentive to the title used by the student. According to conventions in professional communication, when writing a business letter or addressing someone in a formal setting, it is critical to use the correct title. For an individual who holds a PhD or is a professor, like Dr. Bogdarian, the correct form of address would be either “Dr. Bogdarian” or “Professor Bogdarian”, depending on the context and the preference of the individual.
Given the information that Dr. Bogdarian has a PhD and assuming she is working in an academic setting, she might have preferred the title “Dr.” as it is a higher-ranking academic title than “Ms.” which is a general honorific for women regardless of their marital status. As such, option D (“Used the title 'Dr. Bogdarian'”) is typically the correct way to address her unless the student had knowledge of her particular preference for a different title.