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.
Some people might feel uncomfortable knowing where they belong. Sometimes people feel shy about it or annoyed. Maybe there not satisfied with knowing this information
Sincerely
Savagemimi
I hope this helps ;)
I think the last revision is the answer, as both are independent of each other and tell us two separate clauses in the same sentence
