Read the following sentence from the section "Royal remembrance."

“Today, over 150,000 oracle bones have been found.”

Which sentence from the same section BEST explains what is meant by “oracle bones”?

a. Some of the bronze objects found contained the first Chinese characters ever written If the ancestors of a family were pleased, life for that family would be prosperous. If the spirits were not pleased however, tragedies could occur.

b. In addition to bronze, examples of the early Chinese writing system include inscriptions on animal bones. The last king of the Shang dynasty, King Zhou, was a cruel man known for his methods of torture. The dynasty had been weakened by repeated battles with nomads and rivaling tribes within China.

c. Ancient Chinese priests commonly used tortoise shells and cattle bones to answer questions about the future

d. Writing made on books of bamboo strips and silk could not survive being buried in the earth for hundreds of years.