Sentences are of four types: declarative, imperative, interrogative and exclamatory. Declarative sentences are the sentences which are a simple statement. Imperatives sentence is the sentence in which command, order, suggestion or advice is given. Interrogatives sentences are the sentences in which questions are asked. Imperative sentences are the sentence in which sudden feelings are expressed.
The answer is A, John and Mary are dating!Why? Because a declarative sentence is a sentence which is making a statement, answer B and C would be considered a question and answer D would be an action.
