It was mainly around the years of 1630 I believe.
The correct answer to the question above is (d.) performing better than those of most other industrialized nations. In the 1980s, reports regarding on education revealed that the U.S. schools were performing much more better than those industrialized nations.
Galerius stopped persecution of Christians although not for long. It was not until Constantine signed the Edict of Milan that the persecution came to a cease.