Membership in the european union requires countries to have which type of government?

If one country wants to become an EU member state, they have to satisfy the “Copenhagen criteria”:
- a STABLE DEMOCRACY
And the rule of law
- a free-market economy
- the acceptance of all EU legislation, including of the euro.

To answer your question, a state has to have a representative democracy. EU countries do not have the same type of government because they have different histories. There are three types of government of the EU member states now:
Parliamentary republic (Italy, Germany, Greece — most of them actually)
Semi-presidential republic (Romania, France, Poland, Portugal)
Parliamentary constitutional monarchy (with a king/queen, like the UK, Belgium, Netherlands, Spain, Sweden, Denmark)

Although nelson mandela was arrested for treason and sentenced to life in prison, he was not arrested in 1964. he was arrested in 1962. therefore, letter b is false.