Topic: Sentence (বাক্য),

Best Answer Explained in Below-:

The correct option is D: "are / names." To understand why this is the case, we need to analyze the structure and meaning of the sentence presented.

The sentence reads: “What ____ their _____?” followed by the response, “Alexander and Philip.” The sentence is inquiring about something related to "Alexander and Philip" – specifically, it asks for "what" they are, indicating that the answer will explain their identity in relation to the query.

The word "what" implies that a plural subject is expected, as it indicates a question about more than one entity (Alexander and Philip). Therefore, the auxiliary verb must be "are" to agree with the plural subject.

Next, the phrase “their _____” indicates that we are asking for a noun that describes what belongs to or characterizes both Alexander and Philip. Since we are discussing two people, "names" (the plural form) correctly fits this context. Hence, "names" conveys that we are inquiring about the names associated with both Alexander and Philip.

Thus, the sentence becomes: “What are their names?” This structure is grammatically correct and contextually makes sense, confirming that "are" and "names" in option D provide the appropriate answer.