Choose the option/options that contain a Declarative/Assertive Sentence:
The correct option is C You are my best friend.
Sentences are mainly divided into four types: declarative, imperative, interrogative, and exclamatory. Declarative sentences merely declare or state something, imperative sentences express command, an order, or a request, interrogative sentences intend to ask a question and exclamatory sentences display extreme or sudden emotion. From these options, the sentence in C declares a fact, hence it's a declarative sentence, and option C is correct. In A, the sentence expresses a request (please) hence it's an imperative sentence. In B, the sentence expresses excitement, hence it's exclamatory and D asks a question. Hence options A, B, and D are incorrect.