Natural rights are rights people have natural law. The DOI lists life, liberty and pursuit of happiness as natural rights. Social contract is
Nero also know as Ceaser (Nero Cladius Divi Claudius filius Caesar Augustus Germanicus), was known for killing hundreds of Christians in his time. One of them, was a fairly famous one who went by the name of Paul. The Apostle Paul. So Nero was responsible for the deaths of hundreds of Christians.
The answer is c : developing a complex system of writing