which of these is in the interrogative mood?\nwhat a surprise!\ni dont know how you do it.\nwhats the best…

which of these is in the interrogative mood?\nwhat a surprise!\ni dont know how you do it.\nwhats the best way to write an essay?\nopen the window, please.
Answer
Brief Explanations:
The interrogative mood is used for asking questions. "What a surprise!" is an exclamatory sentence. "I don't know how you do it." is a declarative sentence. "Open the window, please." is an imperative sentence. "What's the best way to write an essay?" is a question, thus in the interrogative mood.
Answer:
What's the best way to write an essay?