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.
You need a colon and period in your sentence.
<span>“benevolence”
The definition of benevolence is 'kindness, the quality of being well meaning'. This definition does not indicate that the writer is referring at all to any sort of animal or animalistic qualities in the way that 'cub', 'weasel' and 'scratching' do to describe an animal.</span>