Answer: D. The reigns of kings
Explanation:
The Canon of Kings which was preserved by Claudius Ptolemy, recorded the reigns of various kings from the Babylonians to the Persians and to the Ptolemies and the Romans. The accuracy is generally not questioned by historians indicating its accuracy.
The Canon was useful to early astronomers such as Ptolemy would use it to date the lunar eclipses as well as other astronomical events to the various reigns of different kings.
In regard to slavery, the 13th Amendment was made and it abolished slavery and involuntary servitude. This was in 1864-65.
The scenario "Banning CFCs has resulted in the shrinking of a hole in the ozone above Antarctica." illustrates an example of how environmental policies have resulted in the reversal of environmental damage. I hope my answer has come to your help. God bless and have a nice day ahead!
