Which of the following sentences is an Imperative Sentence?

Subject উহ্য রেখে Verb দিয়ে শুরু হওয়া বাক্য imperative sentence হয়ে থাকে. তাছাড়া imperative sentence বাক্যে আদেশ, নিষেধ, উপদেশ, অনুরোধ বুঝায়।
তাই “Read attentively.”  ই হচ্ছে imperative sentence.

অপরদিকে,
You should read attentively. - Assertive sentence
May Allah help you. - Imperative sentence
What a nice book it is! - Exclamatory sentence