A parallel sentence mentions the same grammatical expression twice. I would go with "D". 'Passed' and 'Demonstrated' are both past tense words that express the same past tense grammatical idea.
If you have more questions, feel free to ask me.
Honesty involves telling the truth or opening up to the truth. Assuredness is an act of consoling without the form of doubt or you are sure or exact. Enthusiasm is doing something out of likeness freely. Sincerity is an act which involves these three together. You cannot be sincere without these specific elements.
The glossary helps the reader understand that the carver paid attention to the small details of the sculpture, such as the cheeks and the noses.
What the author is saying in this text is that the sculptures are so precise that they are still impressive when you look at them up close, even though they were not meant to be exhibited directly on the floor, but on a high pedestal. The "jowls" and "muzzle" of the horse are the "things that could not have been seen when they were on their high perch," yet the carver paid as much attention to detail ("cut with as much care") when he sculpted them as if they were at eye level ("as though they had been made for the floor").
Answer:
The ratios of thymine and adenine were similar, as were the ratios of guanine and cytosine.
Best of luck.