Answer:
A. religious messages carved in oracle bones
Explanation:
I have read about the Shang dynasty in school, so how they developed writing is in my notebook. When fortune tellers became a thing, they wrote a fortune on a bone and threw the bones into a fire. The fortune teller would read the cracks on the bone. They used that writing for documents on paper.
Chromosomes is what DNA is bundled into :)
Answer: Memorial Day was declared a national holiday in 1971