D is an example of a declarative sentence
Cat's personalities and dog's personalities are often considered calming to humans.
The correct answer is D.
The author talks about the great diversity of birds that can be found Madagascar's fauna and thinks this is "triuly marvelous".
By saying this, the author is giving his personal opinion and thoughs, making the statement subjective, rather than objective.
Answer:
I must always obey to my parents.
I mustn't steal anything from anyone.
