The best and most correct answer among the choices provided by the question is D.) Susan has a heart of gold when it comes to caring for stray cats. Hope this helps :)
B, a simple sentence is only an independent clause
If you mean which sentance best represents the moral of the story then it would be the second to last sentence: "At last a Wolf really did come, and the Boy cried, "Wolf! wolf!" as loud as he could: but the people were so used to hearing him call that they took no notice of his cries for help."
D. It will highlight the historical significance of bicycles for women.
So you can "read in between the lines" so to say, Teachers want you to re-read what you have read to develop a deeper understanding.