The answer is c
I had the same question on a test
Answer: The last one because it's an opinion not a fact
The Egyptian Pyramids is one example of a construction made of large stones. HOWEVER, The question seems that there should be pictures included, but there is not. So I give an example to help however I can, Feel free to comment and give more context if you wish for further help.
I believe there are a couple of things missing, such as the author of the article or the sponsor