The correct option is A It declares an action or states an opinion.
Sentences are mainly divided into four types: declarative, imperative,
interrogative and exclamatory. Declarative sentences merely declare or
state something, imperative sentences express a command, an order or a
request, interrogative sentences intend to ask a question and
exclamatory sentences display extreme or sudden emotion. Using this explanation, option A is correct and the rest of the options are incorrect.