"Creeping silently into the dimly lit hall, I heard the faint sound of breathing. " What type of sentence is written above?

Declarative Sentence

Explanation:

Declarative Sentences are sentences used to inform the reader of something and let him know a certain situation.

We can declare the sentence shown in the question above as declarative, because it is through it that the author informs the reader about the poor lighting of the corridor and the weak sound of the breath, providing a tone of mystery and suspense in the narrative.